Business Data Communications- Infrastructure, Networking and Security, 7E William Stallings Tom Case

Business Data CommunicationsInfrastructure, Networking and Security, 7E By William Stallings Tom Case

Email: richard@qwconsultancy.com

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

CHAPTER 1: INTRODUCTION

TRUE OR FALSE 1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

T T F T T F T T F T F F T F T

MULTIPLE CHOICE 1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

B B B D A A D A A B C D A B C

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

SHORT ANSWER 1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

wireless Local Area Network (LAN) Wide Area Network (WAN) client/server infrastructure effectiveness RTC (real-time communications) dashboard Presence Web conferencing Unified messaging circuit switching packet switching ISO (International Organization for Standardization) ITU (International Telecommunication Union) NIST (National Institute of Standards and Technology)

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

CHAPTER 1: INTRODUCTION TRUE OR FALSE T

F

1. The four forms of information used by modern information systems are voice, data, image, and video.

T

F

2. The number of computers and terminals at work in the world today is over 100 million.

T

F

3. Communications technologies using data networks have essentially replaced telephone networks in today’s business settings.

T

F

4. Computerization has enhanced the range of features available to businesses for voice communication.

T

F

5. The need to store and transmit images has been a driving force in the development of networking technology.

T

F

6. Video networks in business are used primarily to deliver programming.

T

F

7. Data compression is used to minimize the amount of information that must be transmitted in networks.

T

F

8. The major cost component for communications is the resource needed to transmit data across distance.

T

F

9. Wireless networks have the advantage of mobility, but the disadvantage of difficult implementation.

T

F

10. The basic building block of any communications facility is the transmission line.

T

F

11. The two media technologies currently driving the evolution of data communications networks are local area networks and cable television networks.

T

F

12. The most common example of packet switched technology is the modern telephone network.

T

F

13. Mobility is the newest frontier for ICT managers.

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

T

F

14. Cloud computing is being embraced by all major business software vendors with the exception of Oracle.

T

F

15. Convergence refers to the merger of previously distinct telephony and information technologies and markets.

MULTIPLE CHOICE 1. The three forces that have driven the architecture and evolution of data communications and networking facilities are: A. Traffic growth, advances in technology, and legal considerations B. Traffic growth, development of services, and advances in technology C. Development of services, advances in technology, and legal considerations D. Advances in technology, lower costs, and greater capacities 2. Which of the following is NOT one of the four types of information found on networks?

A. data

B. control

C. video

D. voice

3. Which of the following is NOT one of the stated trends in technology identified as contributing to increasing traffic and services in networks?

A. The emergence of the Internet B. More and more people are discovering the World Wide Web as a valuable resource C. The ever-increasing use of mobile devices and applications D. Increasing quality and variety of services in both voice and data networks

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

4. Among the application services lists given below, which lists the services in order such that the desired throughput rates are increasing?

A. Still image transfers, large file transfers, transaction processing, and voice B. Voice, transaction processing, still image transfers, and large file transfers C. Large file transfers, voice, transaction processing, and still image transfers D. Transaction processing, voice, still image transfers, and large file transfers 5. Commonly referred to as cell relay, _________ is a culmination of advancements in both circuit switching and packet switching A. asynchronous transfer mode

B. frame relay

C. convergence

D. MAN

6. Which of the following is NOT one of the main application areas that serve as one of the drivers in determining the design and makeup of enterprise networks?

A. Transaction processing

B. IP telephony

C. Multimedia messaging

D. E-business

7. The concept that describes the merger of previously distinct telephony and information technologies and markets is called ___________.

A. unification

B. outsourcing

C. merger

D. convergence

8. Which of the following is NOT one of the four layers in the model of businessdriven convergence?

A. Networks

B. Infrastructure

C. Management

D. Services

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

9. The types of networks commonly used in businesses today include: A. Local area networks, wide-area networks, and telephone networks B. Local area networks, telephone networks, and voice mail networks C. Wide area networks, voice mail networks, and email networks D. Voice mail networks, email networks, and local area networks

10. Which of the following is the most commonly used standard for computer communications?

A. SLA

B. TCP/IP

C. ISO

D. USD

11. In the past, the data processing function was organized around a single computer. Today, it is much more common to find many computers linked by networks. This approach to data processing is called: A. decentralized computing

B. client computing

C. distributed computing

D. connected computing

12. Which of the following are emerging enterprise network applications?

A. video broadcasting and smart objects B. cloud computing and telepresence C. video enriched collaboration and cloud computing D. all of the above 13. At the ________ level the manager deals with the information network in terms of the services that must be available to ensure that users can take full advantage of the applications that they use.

A. enterprise services

B. communications infrastructure

C. network infrastructure

D. application

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

14. __________ is similar to online chat because it is text-based and exchanged bidirectionally in real time.

A. Audio conferencing

B. Instant messaging

C. Presence

D. Web conferencing

15. __________ allows users in two or more locations to interact simultaneously via two-way video and audio transmission.

A. Web conferencing

B. Unified messaging

C. Videoconferencing

D. Audio conferencing

SHORT ANSWER 1. Two types of transmission media recently gaining in popularity in business communications are __________ connections and fiber optic cables.

2. The type of network commonly used at business premises is called a __________.

3. The type of network commonly used with multiple premises in businesses is called a ____________.

4. An architecture where multiple computers provide database functions, file services, printing services, and other specialized functions on a shared basis for many users is called a _____________ architecture.

5. Convergence can be thought of in terms of a three-layer model of enterprixe communications: applications, enterprise services, and _________.

6. Three key benefits of IP network convergence are: cost savings, transformation, and _________.

7. A __________ is the element that provides UC users with a unified user interface across communication devices.

8. _________ is the ability to determine, in real time, where someone is, how he or she prefers to be reached, and what he or she is currently doing.

9. __________ refers to live meetings or presentations in which participants access the meeting or presentation via a mobile device or the Web, either over the Internet or corporate intranet.

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

10. __________ systems provide a common repository for messages from multiple sources.

11. A classic example of __________ is the telephone network.

12. In a __________ network data are transmitted in a sequence of small chunks that are passed through the network from switching node to switching node along some path leading from source to destination.

13. ___________ is a nongovernmental organization that promotes the development of standardization and related activities with a view to facilitating the international exchange of goods and services, and to developing cooperation in the spheres of intellectual, scientific, technological, and economic activity.

14. The __________ is an international organization within the United Nations System in which governments and the private sector coordinate global telecom networks and services.

15. __________ is a U.S. federal agency that deals with measurement science, standards, and technology related to U.S. government use and to the promotion of U.S. private sector innovation.

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

CHAPTER 2: BUSINESS INFORMATION

TRUE OR FALSE 1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

F T T F T F T F T T F T T F T

MULTIPLE CHOICE 1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

C D A D D A C D B C A C A B B

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

SHORT ANSWER 1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

digital analog lossless lossy private branch exchange (PBX) Text Data control characters ASCII Unicode image vector graphics raster graphics Postscript Quality of Experience (QoE)

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

CHAPTER 2: BUSINESS INFORMATION TRUE OR FALSE T

F

1. Today, all networked information is sent using digital formats.

T

F

2. A single bit of information represents two states or values.

T

F

3. The terms byte and octet describe the same amount of information.

T

F

4. Voice communication can only be done using an analog signal.

T

F

5. PBX and Centrex systems provide similar functionality from the users point-of-view.

T

F

6. Services transmitting video information use a series of vector images to represent moving images.

T

F

7. System response time and system cost are closely related to each other.

T

F

8. Response time is extremely important when implementing email systems.

T

F

9. When transmitting video information, compression ratios can range as high as 100:1 with little loss of perceived quality.

T

F

10. Interlacing is a method of reducing the bandwidth requirements for video transmissions.

T

F

11. When using analog communications, channel capacity is measured in hertz (Hz) where 1 Hz equals 1000 oscillations per second.

T

F

12. The United States national version of IRA is referred to as the American Standard Code for Information Interchange (ASCII).

T

F

13. Common examples of data include text and numerical information.

T

F

14. Raster graphics involves the use of binary codes to represent object type, size, and orientation.

T

F

15. The Joint Photographic Experts Group (JPEG) is a collaborative standards-making effort between ISO and ITU-T.

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

MULTIPLE CHOICE 1. Which of the following represents a digital form of information?

A. a gas gauge B. a fax transmission C. a watch that displays time as HH:MM D. a page filled with English prose 2. Which of the following represents the most basic unit of digital information?

A. byte

B. nibble

C. pixel

D. bit

3. Standard voice telephone lines, such as those found in residences, limit bandwidth to:

4.

5.

6.

A. 300 Hz

B. 3,400 Hz

C. 20,000 Hz

D. 1,410,000 Hz

A stereo compact disc typically requires the bandwidth for each channel to be: A. 300 Hz

B. 3,400 Hz

C. 8,000 Hz

D. 20,000 Hz

When using data communications with 8-bit codes, the number of alphabetic symbols A. must be exactly 256

B. must be exactly 512

C. can be greater than 1024 bytes

D. must be less than 256

The time interval between when a user presses a key and when the result of that action arrives at his or her workstation is called the: A. response time

B. turn-around time

C. think time

D. delay time

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

7.

8.

9.

10.

11.

12.

In digital systems, the information rate and the capacity of a digital channel are measured in: A. mhz

B. dps

C. bps

D. ghz

Analog information sources include: A. sounds

B. music

C. video

D. all of the above

Historically, the most commonly used text code is the __________, in which each character in this code is represented by a unique 7-bit pattern.

A. UTF-8

B. IRA

C. Morse code

D. none of the above

The number of different characters that can be represented in the International Reference Alphabet text code is: A. 512

B. 256

C. 128

D. 64

_________ is capable of representing symbols and characters used in all the major languages spoken around the world.

A. UTF-8

B. ASCII

C. IRA

D. UCST

A ________ is the smallest single component of a digital image.

A. RGB

B. megapixel

C. pixel

D. none of the above

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

13.

14.

15.

_________ images are the most common type of image being transmitted over today’s enterprise networks.

A. Color

B. Black and white

C. Pixilated

D. Grayscale

The most widely used format for raster-scan images is referred to as _______.

A. TIFF

B. JPEG

C. PNG

D. PDF

_________ screens use thin sandwiches of glass containing a liquid-crystal material to display images.

A. PDF

B. LCD

C. CRT

D. all of the above

SHORT ANSWER 1. A __________ system uses a sequence of discrete, discontinuous values or symbols to represent information.

2. Nondigital __________ systems use a continuous range of values to represent Information.

3. With _________ compression receivers can reproduce an exact digital duplicate of the original audio stream transmitted by the sender by expanding/decompressing the file that is received.

4. When _________ compression is used, irreversible changes are made to the original file that diminish the quality of the original audio stream when the receiver decompresses the file.

5. A _________ is an on-premise telephone switch, owned or leased by an organization that interconnects the telephones at that location and provides outside access to the public telephone systems and other voice services.

6. ________ files contain very little formatting and do not support formatting such as boldface, italics, or underline.

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

7. ________ consists of information that can be represented by a finite alphabet of symbols, such as the numbers 0 through 9 or the symbols represented on a computer keyboard.

8. Some of the International Reference Alphabet text code patterns represent invisible, nonprintable characters called __________.

9. The _________ (IRA) character set is the most common format for English language text files.

10. _________ is a 16-bit code that is backward compatible with IRA/ASCII. 11. The _________ service supports the communication of individual pictures, charts, or drawings.

12. A representation of images that uses straight and curved line segments is called ________.

13. A representation of images that uses an array of pixels is called ______.

14. ________ is a page-description language that is built into many desktop printers and virtually all high-end printing systems.

15. _________ is a subjective measure of the user’s perception of the overall value of the network application or service.

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

CHAPTER 3: DISTRIBUTED DATA PROCESSING

TRUE OR FALSE 1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

F T T F F F F T T T T F T F F

MULTIPLE CHOICE 1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

C D D B A D D B D A C B D A C

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

SHORT ANSWER 1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

Big data vertical client – server data center centralized distributed distributed distributed HANA (High Performance Analytic Appliance) Virtualization network Servers intranet extranet application service providers (ASPs)

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

CHAPTER 3: DISTRIBUTED DATA PROCESSING TRUE OR FALSE T

F

1. Traditionally, data processing has been organized in a distributed model.

T

F

2. Centralized data processing typically involves terminals connected to large computers in a central data processing facility.

T

F

3. Intranets use the same communication protocols and applications as the Internet.

T

F

4. Like the Internet, intranets are difficult to manage.

T

F

5. Extranets use different protocols and applications than are used in Intranets.

T

F

6. Retail point-of-sale systems are an example of horizontal partitioning of data processing.

T

F

7. Database applications are always distributed applications.

T

F

8. Replicated databases involve copying all or part of the database to additional computers.

T

F

9.

T

F

10. The three types of requirements for networking resulting from DDP are connectivity, availability, and performance.

T

F

11. Big data and the evolution of data processing and communications technologies continue to reshape the balance of centralized and distributed processing within enterprise networks.

T

F

12. In a centralized architecture, the data processing for an application takes place on the user’s computing device.

T

F

13. A data processing facility may depart in varying degrees from the centralized data processing organization by implementing a DDP strategy.

A partitioned database is by definition not a replicated database.

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

T

F

14. There has been a decreasing trend toward distributed data processing.

T

F

15. Accessibility refers to the percentage of time that a particular function or application is available for users.

MULTIPLE CHOICE 1. Which of the following is NOT a feature of an Intranet?

A. uses Internet based standards, such as HTML and SMTP B. is used to connect both local and remote sites into one network C. is used to distribute content to the general Internet D. can be effectively managed 2. Which of the following does distributed processing typically not support?

A. applications

B. device controllers

C. data

D. mainframes

3. Which of the following is NOT a benefit of distributed data processing?

A. increased responsiveness to organizational needs B. better correspondence to organizational patterns C. greater user involvement and control D. enhanced centralization of data definitions 4. Which of the following is not a function provided by servers in client/server systems?

A. printing services

B. data entry

C. database services

D. gateways

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

5. The three ways of organizing data for use by an organization are: A. centralized, replicated, and partitioned B. centralized, structured, and partitioned C. structured, replicated, and partitioned D. centralized, replicated, and structured 6. A data center can occupy: A. a single room in a building

B. one or more floors

C. an entire building

D. all of the above

7. A DDP facility may include: A. a central data center

B. satellite data centers

C. a community of peer computing facilities

D. all of the above

8. Which of the following is NOT a requirement for the Corporate Computing Function?

A. provide computing services in a reliable, professional, and technically competent manner B. deploying technology in ways that make the work productive and not be concerned about whether or not the technology makes work enjoyable for employees C. provide computing capabilities to all organizational units that need them D. assist in satisfying the special computing needs of user departments

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

9.

Which of the following is common in today’s data centers?

A. redundant/backup power supplies B. environmental controls C. data communication connections D. all of the above

10.

11.

12.

13.

14.

No redundancy guarantees for servers, storage systems, network equipment, and communication connections to Internet or other networks; single path for power and cooling distribution; no redundant components; and availability: 99.671% are _________ characteristics of data centers.

A. Tier 1

B. Tier 2

C. Tier 3

D. Tier 4

With __________ virtualization software is used to allow a piece of computer hardware to simultaneously run multiple operating system images.

A. network

B. server

C. operating system

D. storage

_________ virtualization disguises the complexity of the underlying communications network.

A. Server

B. Network

C. Storage

D. Operating system

Which of the following is a category of ASP business?

A. functional/specialist

B. vertical market

C. enterprise

D. all of the above

___________ encompasses any subscription-based or pay-per-use service that extends an organization’s existing IT capabilities over the Internet in real time.

A. Cloud computing

B. ISP

C. DDP

D. Client/server architecture

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

15.

A _________ is a dedicated network that provides access to various types of storage devices including tape libraries, optical jukeboxes, and disk arrays.

A. BI

B. DW

C. SAN

D. NAS

SHORT ANSWER 1.

________ refers to everything that enables an organization to create, manipulate, and manage very large data sets (measured in terabytes, petabytes, exabytes, etc.) and the facilities in which these are stored.

2.

Two types of distributed data processing are horizontal and _________ partitioning.

3.

An increasingly common organizational approach for distributed data processing is the ___________ architecture.

4.

A __________ is a facility that houses computer systems and their associated components including storage and telecommunication systems.

5.

In a __________ data processing architecture, data processing is done on one, or a cluster of computers, generally powerful and/or physically large, located in a central data processing facility.

6.

When a _________ data processing strategy is followed, computers are dispersed throughout an organization.

7.

Responsiveness, availability, end-user productivity, and resource sharing are benefits of __________ data processing.

8.

More challenging failure diagnosis, more dependence on communications technology, incompatibility among equipment, and incompatibility among data are potential drawbacks of __________ data processing.

9.

SAP’s in-memory computing system is called _________.

10. ________ is the creation of a virtual, rather than actual, version of something.

11. Four categories of virtualization are: operating system virtualization, server virtualization, storage virtualization and __________ virtualization.

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

12. _________ are specialized computers that provide services for clients such as database services, printing services, and communication services.

13. An _________ provides users of client devices with applications associated with the Internet but isolated within the organization.

14. The distinguishing feature of the _________ is that it provides access to corporate resources by authorized outside clients, typically suppliers and customers of the organization.

15. The businesses that provide computer-based services to business subscribers over a network are called ___________.

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

CHAPTER 4: DATA TRANSMISSION

TRUE OR FALSE 1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

T T T T F F F T F T T T F T T

MULTIPLE CHOICE 1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

B C A B A B A B A B C A D B C

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

SHORT ANSWER 1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

digital analog digital periodic peak amplitude frequency Phase wavelength spectrum noise crosstalk Crosstalk channel capacity error rate bandwidth

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

CHAPTER 4: DATA TRANSMISSION TRUE OR FALSE T

F

1. The loudness of a signal is measured by its amplitude.

T

F

2. In the telephone system, conversions are reproduced using the range from 300 – 3400 Hz in order to limit the required capacity of transmission lines.

T

F

3. Digital signaling usually means that the information being conveyed is binary.

T

F

4. Attenuation is the reduction in signal strength as the signal propagates down the transmission path.

T

F

5. Attenuation is greater at lower frequencies.

T

F

6. In order to completely compensate for attenuation, the signal generated must be at least as high in strength than the noise of the channel.

T

F

7. Multipath problems are particularly problematic in line of sight applications.

T

F

8. Refraction refers to the bending of the signal.

T

F

9. Referring to Shannon’s equation, in order to increase the data rate of a signal, we need only increase the bandwidth.

T

F

10. Nearly all signals used for communications are part of the electromagnetic spectrum.

T

F

11. Typically, crosstalk does not have a debilitating effect on signal quality.

T

F

12. Impulse noise is the primary source of error in digital data communication.

T

F

13. An antenna with a fixed area receives more signal power.

T

F

14. For wireless facilities, there is a relatively free choice of where antennas are to be located.

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

T

F

15. The various forms of noise include thermal noise, intermodulation noise, crosstalk, and impulse noise.

MULTIPLE CHOICE 1. Electromagnetic signals: A. are used only for optics B. are used for analog and digital signals C. are used for digital signals only D. are used for analog signals only 2. Analog signals differ from digital signals in that: A. analog signals are represented versus time while digital signals are measured versus frequency B. analog signals are periodic, digital signals are not C. analog signals are continuous while digital signals remain at one constant level and then move to another constant level D. analog signals operate at higher frequencies than digital signals 3. Given a frequency of 60 Hz ( cycles per second ), the period of the signal is: A. 0.166667 sec.

B. 0.166667 Hz.

C. one second

D. 60 seconds

4. A sine wave is a periodic signal that: A. has equal phase, frequency and amplitude B. can be measured in terms of its amplitude, frequency and phase C. has a maximum peak amplitude equal to its frequency D. can be either digital or analog

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

5. The wavelength of an analog signal is: A. the distance traveled by the wave in the time defined by its period B. the distance traveled by the wave in one second C. the period of the wave D. the amplitude of the wave 6. The spectrum of a signal is: A. the lowest frequency value subtracted from the highest B. the range of frequencies in the signal C. all of the frequencies from 0 to the highest frequency used D. the average of the highest frequency and the lowest 7. The bandwidth of a signal is: A. the width of the spectrum B. the average of the frequencies C. the range of frequencies in the signal D. the minimum amplitude of the signal 8. The frequency of human speech is in the range of: A. 20 – 1000 Hz.

B. 20 – 3400

C. 300 – 3400 Hz.

D. 10 – 25,000 Hz.

9. Given a resolution of 320 pixels x 240 pixels, 1 byte of color information per pixel and a transmission rate of 30 frames per second, calculate the bandwidth necessary for this signal: A. 18.4 Mbps

B. 2.3 Mbps

C. 18.4 Kbps

D. 6 Mbps

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

10. Delay distortion is due to: A. wait times between keyboard entry and actual transmission of data B. portions of the signal arriving at the destination at different times C. varying levels of signal strength D. signals generated by internetworking equipment 11. In general, noise can be defined as: A. loud, high amplitude signals B. errors in transmission C. unwanted energy or signals on the transmission path D. analog signals instead of digital 12. Signals produced on a line that is the sum or difference of the signals that created it is: A. thermal noise

B. intermodulation noise

C. crosstalk

D. impulse noise

13. Because of its characteristics, free space loss is a particular problem in: A. microwave tower transmissions

B. WANS

C. dial up or modem transmissions

D. satellite transmissions

14. Atmospheric absorption occurs because of: A. the distance traversed in atmospheric transmission B. the water and oxygen content C. pollution and carbon content D. nitrogen content

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

15. _________ is the unwanted coupling between signal paths.

A. Thermal noise

B. Intermodulation noise

C. Crosstalk

D. Impulse noise

SHORT ANSWER 1.

Data can exist in either analog or _________ form.

2.

A(n) _________ signal is one in which the signal intensity varies in a smooth fashion over time.

3.

A(n) _________ signal is one in which the signal intensity maintains a constant level for some period of time and then changes to another constant level.

4.

The simplest sort of signal is a(n) _________ signal, in which the same signal pattern repeats over time.

5.

The __________ is the maximum height of the wave above or below a given reference point.

6.

The _________ is the number of times the signal makes a complete cycle within a given time frame.

7.

________ is a measure of the position of the waveform relative to a given moment of time within the period of a signal.

8.

The _________ of a signal is defined as the distance between two points of corresponding phase of two consecutive cycles, such as maximum amplitudes or where the wave crosses zero.

9.

The _________ of a signal is the range of frequencies that it contains.

10. For guided media such as twisted pair, coaxial cable, and optical fiber, the most significant sources of signal quality impairments are: attenuation and attenuation distortion, delay distortion, and __________.

11. The four categories of noise are: thermal noise, intermodulation, impulse noise, and __________.

12. __________ has been experienced by anyone who, while having a telephone conversation, has been able to hear another telephone conversation.

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

13. The rate at which data can be transmitted over a given communication path, or channel, under given conditions, is referred to as the ___________.

14. The designer of a communications facility must deal with four factors: the bandwidth of the signal, the data rate that is used for digital information, the amount of noise and other impairments, and the level of __________ that is acceptable.

15. The width of the range of frequencies that comprise the signal is the ________.

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

CHAPTER 5: DATA COMMUNICATION FUNDAMENTALS

TRUE OR FALSE 1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

F F T T T T T T F T F T T F T

MULTIPLE CHOICE 1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

A B D A D C C D A D D A D A A

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

SHORT ANSWER 1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

Signals Signaling Transmission Analog Digital analog signal digital signal modem codec encoding cable synchronous error correction asymmetric digital subscriber line (ADSL) frame

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

CHAPTER 5: DATA COMMUNICATION FUNDAMENTALS TRUE OR FALSE T

F

1. Analog signals are less susceptible to noise interference and are more prone to attenuation than digital signals.

T

F

2. Except for digital cellular telephones, copper wire is required for digital transmission.

T

F

3. Analog encoding of digital information modulates a wave known as the carrier in terms of its phase, frequency or amplitude.

T

F

4. For amplitude, frequency or phase shift keying, that respective characteristic of the carrier wave is change to indicate the next binary digit; these binary digits can be represented by this signal change or a lack of signal change.

T

F

5. In order to compensate for synchronization problems, another type of encoding method called biphase can be employed; these methods place a clock pulse within the data stream.

T

F

6. It is difficult to use low frequencies for unguided radio transmission of data because the antenna dishes would have to be extremely large.

T

F

7. Synchronous serial transmissions are frame based, require the use of a preamble and are more efficient than asynchronous serial transmissions.

T

F

8. Error detection requires that extra bits be introduced into the data stream.

T

F

9. Parity checking for error detection is most reliable for checking communications using high data rates.

T

F

10. Both analog and digital information can be encoded as either analog or digital signals.

T

F

11. One of the least common error-detecting codes is the cyclic redundancy check.

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

T

F

12. The simplest approach to error detection is to append a parity bit to the end of a block of data.

T

F

13. Undetected and uncorrected errors can degrade performance and response times in any system that handles large volumes of data.

T

F

14. For sizable blocks of data, asynchronous transmission is far more efficient than synchronous.

T

F

15. When no character is being transmitted, the line between transmitter and receiver is in an idle state.

MULTIPLE CHOICE 1. Analog signals are: A. continuous

B. discrete

C. discontinuous

D. all of the above

2. Digital signals are: A. continuous

B. discrete

C. discontinuous

D. none of the above

3. In modern communication systems, data is sent from one point to another via: A. input data

B. alternating current (A/C)

C. pressure changes

D. electromagnetic signals

4. One of the main differences between amplifiers and repeaters is that: A. amplifiers forward noise as well as data B. amplifiers clean the signal and then forward it C. amplifiers increase the amount of attenuation D. amplifiers focus primarily on digital signals

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

5. An encoding scheme is used: A. in digital transmission to map binary digits to signal elements B. in analog transmission to clean up the quality of the transmission C. to help minimize errors D. all of the above 6. Each signal change or element is called a: A. bit

B. byte

C. baud

D. signal

7. If a carrier wave is modulated with 4 amplitudes and 4 phase changes, how many possible signal combinations are there?

A. 4

B. 8

C. 16

D. 32

8. A carrier wave is modulated with 4 amplitudes and 4 phase changes; how many bits can be represented with each signal change?

A. 1

B. 2

C. 3

D. 4

9. In Non Return to Zero encoding schemes, the signal or voltage level does not return to 0v (zero volts); one of the problems with this type of encoding is that: A. it is sometimes difficult to synchronize the timing of the transmitter and the receiver B. it does not work well with serial communications C. the signal ground of the transmitter is often different from that of the receiver D. it works only for analog signals

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

10. Asynchronous transmission includes a start and stop bit with each character transmitted to ensure: A. that the total number of bits is a factor of 10 B. to allow a continuous stream of data C. to prevent single bit errors from occurring D. to allow the receiver to maintain synchronization with the sender 11. The efficiency of an asynchronous transmission using 1 stop bit, 1 start bit, and 1 parity bit is: A. 20%

B. 30%

C. 50%

D. 70%

12. Standards are important when devices must communicate together; the four characteristics governed by these standards are: A. mechanical, electrical, functional, and procedural B. electrical, physical, functional, and signaling C. fundamental, mechanical, procedural, and protocol D. protocol, fundamental, physical, and signaling 13. An error-detecting scheme that employs a unique prime number is called: A. parity checking

B. frame sequence checking

C. error checking and error correcting

D. cyclic redundancy check

14. In _________ the phase of the carrier signal is shifted to encode data.

A. PSK

B. FSK

C. ASK

D. BFSK

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

15. ________ is concerned with the content of the signal.

A. Digital transmission

B. Analog transmission

C. Digital signaling

D. Analog signaling

SHORT ANSWER 1.

________ are electric or electromagnetic representations of data.

2.

_________ is the physical propagation of the signal along a communication medium.

3.

__________ is the communication of data across a computer network by the propagation and processing of signals.

4.

_________ data take on continuous values on some interval; for example, voice and video are continuously varying patterns of intensity.

5.

________ data take on discrete values; examples are text, integers, and binary data.

6.

An _________ is a continuously varying electromagnetic wave that may be transmitted over both guided and unguided media.

7.

A _________ is a sequence of voltage pulses that may be transmitted over a wired medium; for example, a constant positive voltage may represent binary 0, and a constant negative value may represent binary 1.

8.

Converting digital data to analog signals involves the use of a _________.

9.

In an operation very similar to that performed by a modem, analog data can be represented by a digital signal; the device that performs this function is a ________.

10. The mapping from binary digits to signal elements is the ________ scheme.

11. A _______ modem permits Internet access over cable television networks.

12. With ________ transmission, a block of bits is transmitted in a steady stream without start and stop codes.

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

13. The process of error control involves two elements: error detection and _________.

14. The _________ is the most widely publicized of a family of modern technologies designed to provide high-speed digital data transmission over ordinary telephone wire.

15. The data plus preamble, postamble, and control information are called a _________.

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

CHAPTER 6: DATA LINK CONTROL AND MULTIPLEXING

TRUE OR FALSE 1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

T F T T T F F T T F T T F T T

MULTIPLE CHOICE 1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

A B A B A A C C D B A D A B B

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

SHORT ANSWER 1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

T-1 FDM (frequency division multiplexing) Physical interface Flow control damaged WDM (wavelength-division multiplexing) TDM (time-division multiplexing) frames channel SONET (Synchronous Optical Network) FDMA (frequency-division multiple access) Persistence data TDM (time-division multiplexing) guardbands

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

CHAPTER 6: DATA LINK CONTROL AND MULTIPLEXING TRUE OR FALSE T

F

1. Stop-and-wait is the simplest form of flow control.

T

F

2. Sliding window is one form of error control.

T

F

3. The two commonly used forms of ARQ are “stop-and-wait” and “go back N”.

T

F

4. A major source of expense in any business distributed data processing environment is transmission cost.

T

F

5. A data link control protocol includes techniques for regulating the flow of data over a communications link and for compensating for transmission errors.

T

F

6. Data link control protocols are only used in private WANs.

T

F

7. In early business computer networks, communication lines were primarily provided by CLECs.

T

F

8. In order to achieve the greatest return on their data communication investments, it is important for businesses to maximize the amount of information carried over their transmission lines.

T

F

9. The organization sacrifices efficiency when it wastes money on communication lines with capacities that are much higher than it needs.

T

F

10. Physical interface standards include all of the required functions for data communication.

T

F

11. It is common for a printer to be equipped with a higher data rate capability than its printing capability.

T

F

12. Flow control is one of the primary functions performed at the data link layer of the OSI reference model for network communication.

T

F

13. A disadvantage of sliding window flow control is that it is not supported by many data link control protocols.

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

T

F

14. Data link control protocols provide mechanisms by which the two sides cooperate in the retransmission of frames that are detected to include errors.

T

F

15. Sharing capacity with other communication devices is multiplexing.

MULTIPLE CHOICE 1. Which of the following is NOT a common component of an error control process?

A. damaged frame

B. error detection

C. positive acknowledgement

D. retransmission after timeout

2. Which of the following is a generic term that describes sharing of a communications channel by multiple communicating stations?

A. multiprogramming

B. multiplexing

C. multi-access channels

D. digital channels

3. A multiplexing technique where multiple users use distinct carrier frequencies separated such that the modulated signals do not overlap is called ___________.

A. frequency division multiplexing

B. time division multiplexing

C. separate channel multiplexing

D. common channel multiplexing

4. A multiplexing technique where multiple users use distinct time slots such that the transmitted bits are shared by all users is called ___________.

A. frequency division multiplexing

B. time division multiplexing

C. separate channel multiplexing

D. common channel multiplexing

5. Present-day television, both broadcast and cable, employ: A. frequency division multiplexing

B. separate channel multiplexing

C. separate frequency multiplexing

D. common channel multiplexing

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

6. Which of the following is NOT one of the example applications of T-1 leased transmission facilities?

A. cable television systems

B. private data networks

C. video teleconferencing

D. high-speed digital facsimile

7. The term “SONET” corresponds to: A. special operations networking environment testing B. synchronous optical networking environment testing C. synchronous optical network D. synchronous operational networking 8. SONET/SDH signal payload speeds range: A. from 902 Mbps to 1.53 Gbps

B. from 1.8 Mbps to 2.4 Gbps

C. from 50 Mbps to 1.53 Gbps

D. from 1.80 Mbps to 153 Gbps

9. ________ is popular for constructing private networks within geographically dispersed organizations and is increasingly used to provide business-user access to public telephone networks A. UTI-1

B. PBX

C. FDM

D. T-1

10. ________ is used on SONET to support long-haul voice, data, and video applications over fiber-optic circuits.

A. WDM

B. TDM

C. DMT

D. LMV

11. Most cordless digital telephone systems used in homes employ ________ or time division duplexing along with FDM. A. TDMA

B. GSM

C. ITU-T

D. SDH

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

12. Which of the following is a common technique for error control?

A. error detection

B. retransmission after timeout

C. positive acknowledgement

D. all of the above

13. _______ is the most heavily used multiplexing technique and is familiar to anyone who has ever used a radio or television set.

A. FDM

B. TDM

C. RTM

D. TRMT

14. With ________ the light steaming through the fiber consists of many colors, or wavelengths, each carrying a separate channel of data.

A. LCF

B. WDM

C. TDM

D. FWD

15. ________ uses multiple carrier signals at different frequencies, sending some of the bits on each channel.

A. FWD

B. DMT

C. WDM

D. TDM

SHORT ANSWER 1.

One of the most popular forms of synchronous TDM is known as ________.

2.

Although the use of ________ for voice transmission is declining, it is still used widely for television distribution systems, including broadcast television and cable TV.

3.

_________ standards provide a means by which a stream of data can be transmitted, either synchronously or asynchronously, onto a transmission medium.

4. ________ is a technique for assuring that a transmitting entity does not overwhelm a receiving entity with data.

5. A __________ frame is a recognizable frame that arrives, but some of the bits have been altered during transmission.

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

6. ________ is used in fiber-to-the-home (FTTH) systems.

7. _________ is possible when the data rate of the transmission medium exceeds the required data rate of signals to be transmitted and a number of digital signals, or analog signals carrying digital data, can be carried simultaneously by interleaving portions of each signal in time.

8. The data transmitted by a synchronous TDM system are organized into ________, each of which contains a cycle of time slots.

9. The set of time slots dedicated to one source, from frame to frame, is called a ________.

10. __________ is an optical transmission interface that was originally designed for the public telephone network and has been standardized by ANSI for voice, long-haul data, and/or video traffic applications.

11. When ________ is used, the radio spectrum used to connect mobile devices and cell towers is divided into separate frequency channels; each channel is capable of carrying one call.

12. ________ refers to a connection’s ability to weather changes to topology, protocol, and speed as a user moves.

13. The higher the ________ rate, the more cost-effective the transmission facility.

14. Two types of multiplexing techniques discussed in this chapter are FDM and _______.

15. To prevent interference, the channels are separated by ________, which are unused portions of the spectrum.

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

CHAPTER 7: THE INTERNET

TRUE OR FALSE 1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

F F T F T T T T F T T F F T T

MULTIPLE CHOICE 1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

B C A C C A B D A B C A A C D

SHORT ANSWER

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

ARPANET Internet TCP/IP message Telnet IP address HTML (HyperText Markup Language) HTTP (Hypertext Transfer Protocol) POP (point of presence) Central Office (CO) ISP IXP (Internet Exchange Point) NSPs (Network Service Providers) domain DNS (domain name space)

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

CHAPTER 7: THE INTERNET TRUE OR FALSE T

F

1. The Internet grew out of a Department of Education project.

T

F

2. ARPANET was the first message-switching network.

T

F

3. When using circuit switching, a dedicated path of transmission facilities is established between the communicating parties.

T

F

4. When using message switching instead of packet switching, a dedicated path must be established between the parties for all messages that are sent.

T

F

5. Packet switching is like message switching except that the unit of data sent at one time is limited in size, thus requiring larger messages to be broken into pieces.

T

F

6. A computer connected to the Internet is called a “host”.

T

F`

7. The National Science Foundation was responsible for many of the policy decisions that led to the modern Internet.

T

F

8. In the Internet, individual hosts and/or local area networks are connected to an Internet services provider through a point-ofpresence.

T

F

9. Commercial use of the Internet was discouraged until approximately 1988.

T

F

10. Hosts connected to the Internet are identified by a unique 24-bit number that identifies a network and specific host within that network.

T

F

11. The Internet is a central component of most enterprise networks.

T

F

12. The Internet is an unusual corporate tool in that it is owned and managed by a single entity.

T

F

13. End users typically contact all of the company servers by IP address rather than by name.

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

T

F

14. If you receive an IP address automatically, the address of the DNS server can be provided at the same time.

T

F

15. DNS is actually a huge collection of servers working together in hierarchy.

MULTIPLE CHOICE 1. A paradigm for electronic communications where a dedicated path is opened and maintained during the exchange is called _________.

A. message switching

B. circuit switching

C. packet switching

D. data switching

2. A paradigm for electronic communications where messages are split into blocks of data with limited size, which are then transmitted one-by-one across the network is called _________.

A. message switching

B. circuit switching

C. packet switching

D. data switching

3. The first two important applications developed for the ARPANET were: A. Telnet and FTP

B. Telnet and email

C. FTP and email

D. email and world-wide-web

4. The first “killer application” for the ARPANET was ________.

A. Telnet

B. FTP

C. email

D. remote login

5. The development of an internationally distributed collection of multimedia files addressed using universal resource locators led to the: A. Telnet package

B. email system

C. world-wide-web

D. FTP package

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

6. The problem of using IP numbers for addressing hosts in the Internet are resolved using __________.

A. the concept of domains and the use of domain names B. the use of Telnet applications C. the use of email servers D. splitting IP addresses into four octets 7. The Domain Name System (DNS) is comprised of four elements; which of the following is NOT one of these elements?

A. DNS database

B. IP addresses

C. name servers

D. resolvers

8. The key features of the DNA database are: A. variable-depth hierarchy for names, distributed databases, and name servers B. resolvers, distributed databases, and name servers C. distribution controlled by the database, resolvers, and distributed databases D. variable-depth hierarchy for names, distributed databases, and distribution controlled by the database 9. __________ is telecommunications equipment that is located on the customer’s physical location rather than on the provider’s premises or in between.

A. CPE

B. ISP

C. CO

D. IXP

10. A company that provides other companies or individuals with access to, or presence on, the Internet is a(n) __________.

A. point of presence

B. ISP

C. network service provider

D. central office

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

11. The ________ is one of a number of major Internet interconnection points that serve to tie all the ISPs together.

A. CPE

B. POP

C. IXP

D. NSP

12. The ________ is a company that provides backbone service to an ISP. A. NSP

B. CO

C. IXP

D. CPE

13. A ________ is a site that has a collection of telecommunications equipment and usually refers to ISP or telephone company sites.

A. POP

B. NSP

C. CPE

D. IXP

14. _________ are programs that extract information from name servers in response to client requests.

A. Name servers

B. DNS

C. Resolvers

D. IP datagram

15. The domain ________ is for network support centers, Internet service providers, and other network-related organizations.

A. org

B. info

C. com

D. net

SHORT ANSWER 1.

The Internet evolved from the _________, which was developed in 1969 by the Advanced Research Projects Agency (ARPA) of the U.S. Department of Defense.

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

2.

The ________ is a global information system logically linked together by a globally unique address space based on the Internet Protocol or its subsequent extensions/follow-ons.

3.

The Internet is able to support communications using the ________ suite or its subsequent extensions/follow-ons, and/or other IP-compatible protocols.

4.

Traditionally, the two primary paradigms for electronic communications were circuit switching and _________ switching.

5.

_______ provides a universal language for remote computer terminals.

6.

Each packet includes a unique numeric address of the destination host, which is referred to as an __________ because the address is carried in an IP packet.

7.

The layout of the browser display is controlled by the __________ standard, which defines embedded commands in text files that specify features of the browser display, such as the fonts, colors, images and their placement on the display, and the location of the locations where the user can invoke the hyperlinks and their targets.

8.

The __________ is a communications protocol for use in TCP/IP networks for fetching the files from the appropriate servers as specified by the hyperlinks.

9.

Individual hosts and LANs are connected to an Internet Service Provider (ISP) through a __________.

10. The _________ is the place where telephone companies terminate customer lines and locate switching equipment to interconnect those lines with other networks.

11. The most important service an ISP provides is access to other _________ networks.

12. An ________ is a physical facility that provides the infrastructure to move data between connected networks.

13. The networks connected at an IXP are owned and operated by _________.

14. A ________ refers to a group of hosts that are under the administrative control of a single entity, such as a company or government agency.

15. ________ is based on a hierarchical database containing resource records that include the name, IP address, and other information about hosts.

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

CHAPTER 8: TCP/IP

TRUE OR FALSE 1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

T T F F T T T T F F T T T F F

MULTIPLE CHOICE 1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

D D B B D B C A C C B A A D C

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

SHORT ANSWER 1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

Wireless TCP/IP PDU (protocol data unit) packet checksum TCP/IP suite router TCP SNMP (Simple Network Management Protocol) IPv6 SMTP (Simple Mail Transfer Protocol) SSH (Secure Shell) HTTP (HyperText Transfer Protocol) ISs (intermediate systems) Communication network

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

CHAPTER 8: TCP/IP TRUE OR FALSE T

F

1. Protocol architectures are a set of complementary protocol modules governing communication between entities in a network.

T

F

2. TCP/IP is a protocol architecture.

T

F

3. UDP provides guaranteed delivery of messages.

T

F

4. LANs and WANs are usually isolated entities.

T

F

5. A router is a more complex intermediate system than a bridge.

T

F

6. EOIP encourages the development of IP applications for all major types of business data as well as IP-based, or IP-compliant, telecommunications transport.

T

F

7. The System Network Architecture of IBM is a proprietary layered protocol architecture.

T

F

8. Standards can be developed simultaneously for protocols at each layer of the architecture.

T

F

9. Wireless networks cannot be deployed without the aid of the network administrators.

T

F

10. WLAN standards have been designed to replace Ethernet.

T

F

11. IP is also becoming the language of the telephone system.

T

F

12. There are many protocols and technologies to select from when building an entire communication system.

T

F

13. OSI is another standardized architecture that is often used to describe communications functions but is now rarely implemented.

T

F

14. When two or more computers are interconnected via a communication network, the set of computer stations is referred to as a “computer connection”.

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

T

F

15. The network access layer contains the logic needed to support the various user applications.

MULTIPLE CHOICE 1. The TCP/IP architecture contains ________ layers.

A. two

B. three

C. four

D. five

2. Wireless networking brings: A. increased security risks

B. management headaches

C. increased demands on support staff

D. all of the above

3. ________ is a Cisco proprietary product.

A. VoIP

B. SKINNY

C. SMTP

D. SIP

4. The key elements of a protocol are: A. syntax, structure, timing B. syntax, semantics, structure C. structure, semantics, format D. format, syntax, semantics 5. Which of the following is a commonly used set of standards for computer communications?

A. SLA

B. ISO

C. POP

D. TCP/IP

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

6. A device that connects networks with differing addressing schemes, packet sizes and interfaces is called a ___________.

A. hub

B. router

C. switch

D. repeater

7. The current IP specification uses addresses to identify hosts that consist of: A. 16 bits

B. 64 bits

C. 32 bits

D. 128 bits

8. The newer IPv6 specification uses addresses to identify hosts that consist of: A. 128 bits

B. 64 bits

C. 32 bits

D. 16 bits

9. The ________ layer is concerned with the exchange of data between a computer and the network to which it is attached.

A. transport

B. application

C. network access

D. physical

10. The ________ layer contains the logic needed to support the various user applications.

A. network access

B. physical

C. application

D. transport

11. Transport PDUs are typically called ________.

A. channels

B. segments

C. bridges

D. frames

12. The ________ layer covers the physical interface between a data transmission device and a transmission medium or network.

A. physical

B. transport

C. application

D. network

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

13. IP appends a header of control information to each segment to form a(n) __________.

A. IP datagram

B. end system

C. checksum

D. port

14. The ________ supports a basic electronic mail facility by providing a mechanism for transferring messages among separate hosts.

A. SNMP

B. SSH

C. HTTP

D. SMTP

15. The _________ is used to send files from one system to another under user command.

A. UDP

B. SMTP

C. FTP

D. SSH

SHORT ANSWER 1.

__________ networking brings with it the advantages of connectivity without being tethered, faster/lower cost deployment and the connection of geographically remote sites.

2.

________ is an Internet-based standard and is the framework for developing a complete range of computer communications standards.

3.

The combination of data from the next higher layer and control information is known as a __________.

4.

The network access protocol appends a network access header to the data it receives from the transport layer, creating a network access PDU, typically called a __________.

5.

An error detection code is also referred to as a frame check sequence or a ________.

6.

Two protocol architectures have served as the basis for the development of interoperable protocol standards: the OSI reference model and the ________.

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

7.

A _________ is a device that connects two networks and whose primary function is to relay data from one network to the other on a route from the source to the destination end system.

8.

For most applications running as part of the TCP/IP architecture, the transport layer protocol is _________.

9.

The standard network management protocol for TCP/IP networks is _________.

10. In 1995 the Internet Engineering Task Force issued a specification for a nextgeneration IP; this specification was turned into a standard in 1996 known as _________.

11. Features of ________ include mailing lists, return receipts, and forwarding.

12. ________ provides a secure remote logon capability, which enables a user at a terminal or personal computer to logon to a remote computer and function as if directly connected to that computer.

13. _________ connects client systems to Web servers on the Internet and its primary function is to establish a connection with the server and send HTML pages back to the user’s browser.

14. Subnetworks are connected by devices referred to as __________, which provide a communications path and perform the necessary relaying and routing functions so that data can be exchanged between devices attached to different subnetworks in the internet.

15. A _________ is a facility that provides a data transfer service among devices attached to the network.

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

CHAPTER 9: CLIENT/SERVER, INTRANET, AND CLOUD COMPUTING

TRUE OR FALSE 1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

T T T F F T F T T F T T T F T

MULTIPLE CHOICE 1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

C A B A C D C A A D B C D D C

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

SHORT ANSWER 1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

intranet API (Application Programming Interface) client Middleware relational database server SQL (Structured Query Language) server Middleware nonblocking Nonpersistent persistent Intranet VPN (Virtual Private Network) cloud carrier

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

CHAPTER 9: CLIENT/SERVER, INTRANET, AND CLOUD COMPUTING TRUE OR FALSE T

F

1. Database applications are among the most common client-server implementations.

T

F

2. Most client/server environments emphasize the use of a GUI.

T

F

3. Middleware is used to overcome lack of standardization.

T

F

4. Traditional client/server architecture is also called 3-tier architecture.

T

F

5. Intranets are expensive to implement, but inexpensive to maintain.

T

F

6. Client-server computing is fundamentally based on networking.

T

F

7. Support tools for intranets are easily available.

T

F

8. In a 3-tier client-server implementation, the client is typically a “thin client”.

T

F

9. A server-based processing model uses a “fat server” rather than a “fat client”.

T

F

10. Implementing an extranet removes the need for a company to maintain a public web site.

T

F

11. Typically cloud computing services will be rented from an external company that hosts and manages them.

T

F

12. The service-oriented architecture (SOA) is a form of client/server computing.

T

F

13. The client/server architecture is a blend of decentralized and centralized computing.

T

F

14. A cloud broker evaluates the services provided by a cloud provider in terms of security controls, privacy impact, performance, and so on.

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

T

F

15. NIST defines three service models that can be viewed as nested service alternatives: SaaS, PaaS, and IaaS.

MULTIPLE CHOICE 1. ________ is a set of function and call programs that allow clients and servers to intercommunicate.

A. IaaS

B. SQL

C. API

D. Middleware

2. A computer that houses information for manipulation by networked clients is a __________.

A. server

B. minicomputer

C. PaaS

D. broker

3. A _________ is a networked information requester that can query a database or other information.

A. host

B. client

C. server

D. auditor

4. ________ is a method for addressing, creating, updating, or querying relational databases.

A. SQL

B. API

C. UTI

D. GUI

5. ________ is software that improves connectivity between a client application and a server.

A. SQL

B. API

C. Middleware

D. SAP

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

6. Which of the following is NOT a class of client/server processing?

A. host-based processing B. server-based processing C. client-based processing D. network-based processing 7. Advantages of a web/database system as compared to a more traditional database approach include: A. improved functionality and ease of administration B. ease of administration and transaction tracking C. rapid development and flexible information presentation D. easy deployment and improved functionality 8. ________ machines are typically single-user PCs or workstations that provide a highly user-friendly interface to the end user.

A. Client

B. Host

C. Server

D. Networked

9. _________ processing refers to the traditional mainframe environment in which all or virtually all of processing is done on a central host.

A. Host-based

B. Server-based

C. Client-based

D. Cooperative

10. In a ________ processing configuration, the application processing is performed in an optimized fashion, taking advantage of the strengths of both client and server machines and of the distribution of data.

A. host-based

B. server-based

C. client-based

D. cooperative

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

11. All applications operate over a uniform _________.

A. SQL

B. API

C. SaaS

D. IaaS

12. A common method for encapsulating communication in a distributed system is the __________.

A. SQL

B. PaaS

C. RPC

D. API

13. An advantage of an intranet-based approach to corporate computing is: A. rapid prototyping and deployment of new services B. supports a range of distributed computing architectures C. supports a range of media types D. all of the above 14. A benefit of extranets is: A. reduced costs

B. coordination

C. customer satisfaction

D. all of the above

15. A person or organization that maintains a business relationship with, and uses service from, cloud providers is a __________.

A. cloud carrier

B. cloud broker

C. cloud consumer

D. cloud auditor

SHORT ANSWER 1.

A(n) _________ uses Internet technology and applications to provide in-house support for distributed applications.

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

2.

________ is a set of function and call programs that allow clients and servers to intercommunicate.

3.

A _________ is a networked information requestor, usually a PC or workstation, that can query database and/or other information from a server.

4.

________ is a set of drivers, APIs, or other software that improves connectivity between a client application and a server.

5.

A _________ is a database in which information access is limited to the selection of rows that satisfy all search criteria.

6.

A ________ is a computer, usually a high-powered workstation or a mainframe, that houses information for manipulation by networked clients.

7.

________ is a language developed by IBM and standardized by ANSI for addressing, creating, updating, or querying relational databases.

8.

The traditional client/server architecture involves two levels, or tiers: a client tier and a _________ tier.

9.

__________ products are typically based on one of three underlying mechanisms: message passing, remote procedure calls, and object-oriented mechanisms.

10. With ___________, or asynchronous primitives, a process is not suspended as a result of issuing a Send or Receive.

11. __________ binding means that a logical connection is established between the two processes at the time of the RPC and that as soon as the values are returned, the connection is dismantled.

12. With __________ binding, a connection that is set up for an RPC is sustained after the procedure return.

13. _________ is a term used to refer to the implementation of Internet technologies within a corporate organization rather than for external connection to the global Internet.

14. A _________ is a generalization of the firewall approach and takes advantage of IP security capabilities to allow secure communications between external users and the company’s intranet.

15.

The _________ is a networking facility that provides connectivity and transport of cloud services between cloud consumers and cloud providers.

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

CHAPTER 10: INTERNET-BASED APPLICATIONS

TRUE OR FALSE 1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

F T F T T T F F F T T F T T T

MULTIPLE CHOICE 1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

D A C A B A D B D D A A C B D

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

SHORT ANSWER 1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

multimedia image video audio Streaming HTTPS authentication MSA (mail submission agent) DNS (domain name system) SMTP content-description POP (Post Office Protocol) stateless resource proxy

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

CHAPTER 10: INTERNET-BASED APPLICATIONS TRUE OR FALSE T

F

1. In general, public and Internet mail systems offer access to a wider range of services and more robust applications.

T

F

2. Upon receipt, the SMTP receiver must decide whether to place the message in the appropriate user mailbox or local outgoing mail queue.

T

F

3. In order to be compliant, a mail system must include all five of the additional MIME headers.

T

F

4. MIME subtypes of the multi-part type are used to describe how the different parts of a message go together.

T

F

5. The simplest form of electronic mail is a single-system facility where all users of the facility exchange messages.

T

F

6. SMTP is the standard protocol in the TCP/IP protocol suite for transferring email between hosts.

T

F

7. SMTP does not place any requirements on the contents or message bodies of mail it processes.

T

F

8. SMTP returns an end-to-end acknowledgement to the originator to indicate that the message was successfully delivered to the recipient.

T

F

9. SMTP can be used to send executable files and other binary file types.

T

F

10. The rapid growth in the use of the Web is due to the standardization of all the elements that support Web applications.

T

F

11. HTTP uses a request/response style of communication.

T

F

12. End users should not run virus protection software that examines incoming mail because the administrators of the email servers have already checked for viruses.

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

T

F

13. A security policy should be established and careful consideration given to the personnel allowed external access to internal systems.

T

F

14. Image-based applications include facsimile, computer-aided design (CAD), publishing, and medical imaging.

T

F

15. A number of protocols are instrumental in supporting multimedia traffic.

MULTIPLE CHOICE 1. Email functions visible to a user, such as facilities for preparing and submitting messages, filing, replying, and forwarding, are considered: A. message transfer agent functions B. client functions C. email client functions D. user agent functions 2. Email functions concerned with the protocol operations needed to transmit and deliver messages are considered: A. message transfer agent functions

B. client functions

C. email client functions

D. user agent functions

3. Which of the following is a true statement regarding SMTP processing of messages?

A. messages typically are sent through multiple SMTP systems while going from the sender to the recipient B. the SMTP sender remains responsible for a message until it has been delivered to the recipient C. SMTP does not guarantee that all messages are delivered D. SMTP attempts to send messages until the recipients become available

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

4. A widely used extension to the RFC 822 framework that expands what can be sent via email is called _________.

A. MIME

B. ASCII

C. VoIP

D. SMTP

5. Which of the following is NOT a standard MIME content type?

A. audio

B. binary

C. messages

D. image

6. When using HTTP, an application program that establishes connections for the purpose of sending requests to a server is called a __________.

A. client

B. server

C. host

D. resource

7. When using HTTP, a network data object or service that can be identified by a URL is called a ____________.

A. client

B. server

C. host

D. resource

8. When using HTTP, an application program that accepts connections in order to service requests by sending back responses is called a ___________.

A. client

B. server

C. host

D. resource

9. Which of the following types of intermediate devices can be used in an HTTP network?

A. proxies

B. gateways

C. tunnels

D. all of the above

10. When HTTPS is used, which element of the communication is encrypted?

A. URL of the requested document

B. contents of the document

C. cookies sent from browser to server

D. all of the above

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

11. The _________ is fundamentally a client/server application running over the Internet and TCP/IP intranets.

A. World Wide Web

B. ADMD

C. MDA

D. Hypertext Transfer Protocol

12. The ________ works on behalf of user actors and user applications and is their representative within the e-mail service.

A. MUA

B. MHS

C. MSA

D. MTA

13. The ________ relays mail for one application-level hop.

A. MSA

B. MS

C. MTA

D. MDA

14. A(n) _________ is an Internet e-mail provider.

A. POP

B. ADMD

C. DNS

D. IEP

15. ________ defines a format for text messages that are sent using e-mail.

A. RFC 208

B. RFC 1939

C. RFC 137

D. RFC 822

SHORT ANSWER 1.

VoIP, streaming audio, and streaming video are considered _________ applications even though each involves a single media type.

2.

The ________ service supports the communication of individual pictures, charts, or drawings.

3.

The ________ service carries sequences of pictures in time, in essence, making use of a sequence of raster-scan images.

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

4.

The term “multimedia” refers to four distinct types of media: text, graphics, video, and ________.

5.

________ media refers to multimedia files that begin playing immediately or within seconds after it is received by a computer from the Internet or Web, thus the media content is consumed as it is delivered from the server rather than waiting until an entire file is downloaded.

6.

________ refers to the combination of HTTP and SSL to implement secure communication between a Web browser and a Web server.

7.

SSL provides three categories of security: confidentiality, message integrity, and ___________.

8.

The _________ accepts the message submitted by an MUA and enforces the policies of the hosting domain and the requirements of Internet standards.

9.

The ________ is a directory lookup service that provides a mapping between the name of a host on the Internet and its numerical address.

10. ________ is the protocol used for transfer of mail from a user agent to an MTA and from one MTA to another.

11. The five header fields defined in MIME are: MIME version, content-type, content-transfer-encoding, content-ID, and ___________.

12. The ________ and the Internet Message Access Protocol support retrieval of mail between a client system and a server that holds the mail for the client.

13. HTTP is a ________ protocol; each transaction is treated independently.

14. A _______ is a network data object or service that can be identified by a URL. 15. A ________ is an intermediary program that acts as both a server and a client for the purpose of making requests on behalf of other clients.

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

CHAPTER 11: INTERNET OPERATION

TRUE OR FALSE 1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

F T T F T F F F F T T F T T T

MULTIPLE CHOICE 1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

C B A B A D C B D D A C D B A

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

SHORT ANSWER 1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

host DHCP (Dynamic Host Configuration Protocol) dotted decimal CIDR (Classless Inter-Domain Routing) multicast Unicast Anycast Multicast network reachability neighbor OSPF (Open Shortest Path First) broadcast Elastic Inelastic Differentiated

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

CHAPTER 11: INTERNET OPERATION TRUE OR FALSE T

F

1. The source and destination address fields in the TCP header each contain a 32-bit Internet address.

T

F

2. Most IP addresses consist of a network identification and a host identification within that network.

T

F

3. The left-most bits of a IP address determine whether it is Class A, B, or C.

T

F

4. Subnets are used where the number of networks exceeds the number of hosts within a specific company or organization.

T

F

5. Two notable consumer electronic gadgets that are impacting the traffic load on networks are the digital versatile disc and the digital still camera.

T

F

6. A digital versatile disc can store approximately 100 times more data than a CD-ROM.

T

F

7. The Internet and the Internet Protocol is designed to provide differentiated services depending on whether traffic is elastic or inelastic.

T

F

8. Typically, more complex routing protocols are used between autonomous systems within a larger internet and relatively simple routing protocols are used within each autonomous system.

T

F

9. A QoS facility allows the Internet to treat all classes of traffic equally in order to optimize the services provided to all users.

T

F

10. An internet routing protocol is used to exchange information about reachability and traffic delays, allowing each router to construct a next-hop routing table for paths through the internet.

T

F

11. Typically, an IP address refers to an individual host on a particular network.

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

T

F

12. In an internet environment, multicasting is an easier undertaking.

T

F

13. One way to assure that the packet is received by all members of the group is to broadcast a copy of each packet to each network in the configuration, over the least-cost route for each network.

T

F

14. Both the broadcast and multiple unicast strategies are inefficient because they generate unnecessary copies of the source packet.

T

F

15. IGMP takes advantage of the broadcast nature of a LAN to provide an efficient technique for the exchange of information among multiple hosts and routers.

MULTIPLE CHOICE 1. Which of the following describes class A networks?

A. Many networks, each with a few hosts B. Medium number of networks, each with a medium number of hosts C. Few networks, each with many hosts D. A dedicated network, with a set number of hosts 2. Which of the following describes class B networks?

A. Many networks, each with a few hosts B. Medium number of networks, each with a medium number of hosts C. Few networks, each with many hosts D. A network dedicated to multicast applications

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

3. Which of the following describes class C networks?

A. Many networks, each with a few hosts B. Medium number of networks, each with a medium number of hosts C. Few networks, each with many hosts D. A dedicated network, with a set number of hosts 4. The maximum number of Class A network addresses is __________.

A. 16

B. 126

C. 128

D. 256

5. The IP address is assigned to a network interface on a host when ________.

A. the OS boots up

B. the PC connects to the Internet

C. an application is run

D. the user requests one

6. IPv6 includes ________ address fields.

A. 16-bit

B. 32-bit

C. 64-bit

D. 128-bit

7. Multiple IP addresses referring to a block of CIDR addresses can be identified with a single mask, a process known as __________ .

A. uni-masking

B. OSPF

C. supernetting

D. block masking

8. The _________ in an internet are responsible for receiving and forwarding packets through the interconnected set of networks, making routing decisions based on knowledge of the topology and traffic/delay conditions of the internet.

A. gateways

B. routers

C. channels

D. links

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

9. An autonomous system (AS) exhibits which of the following characteristics?

A. is a set of routers and networks managed by a single organization B. consists of a group of routers exchanging information via a common routing protocol C. except in times of failure is connected D. all of the above 10. A practical application for multicasting is: A. teleconferencing

B. multimedia

C. database

D. all of the above

11. The magnitude of delay variation, called ________ , is a critical factor in realtime applications.

A. jitter

B. stuttering

C. supernetting

D. latency

12. Today, _________ is the most widely accepted QoS mechanism in enterprise networks.

A. AS

B. SLA

C. DS

D. SSL

13. Which of the following detailed performance parameters might be included in an SLA? A. service performance parameters, such as expected throughput, drop probability, and latency B. constraints on the ingress and egress points at which the service is provided, indicating the scope of the service C. traffic profiles that must be adhered to for the requested service to be provided D. all of the above

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

14. The value of the DS field, referred to as the DS ________, is the label used to classify packets for differentiated services.

A. QoS

B. codepoint

C. SLA

D. supernetting

15. A description of the nature of service to be provided, the expected performance level of the service, and the process for monitoring and reporting the service level, is information that is typically included in a _________ .

A. SLA

B. QoS

C. LAN

D. DS

SHORT ANSWER 1. To identify a host on the Internet, each host is assigned a unique IP address, which consists of two logical components: a network component and a ________ component.

2. The IP address is obtained either by looking it up in a configuration file or dynamically, via the ______________.

3. IP addresses are usually written in what is called ___________ notation , with a decimal number representing each of the octets of the 32-bit address.

4. _________ makes more efficient use of the 32-bit IP address than the classbased method primarily because it makes more efficient use of the address space.

5. IPv6 allows three types of addresses: unicast, anycast, and _________.

6. __________ is an identifier for a single interface in which a packet is delivered to the interface identified by that address.

7. _________ is an identifier for a set of interfaces in which a packet is delivered to one of the interfaces identified by that address (the “nearest” one, according to the routing protocols’ measure of distance).

8. _________ is an identifier for a set of interfaces in which a packet is delivered to all interfaces identified by that address.

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

9. Three functional procedures are involved in the Border Gateway Protocol (BGP): neighbor acquisition, neighbor reachability, and __________.

10. The term _________ refers to two routers that share the same network.

11. Using what is known as a link state routing algorithm, the ________ protocol is widely used as an interior router protocol in TCP/IP networks.

12. One way to assure that the packet is received by all members of the group is to ___________ a copy of each packet to each network in the configuration, over the least-cost route for each network.

13. _________ traffic can adjust, over wide ranges, to changes in delay and throughput across an internet and still meet the needs of its applications.

14. _________ traffic does not easily adapt, if at all, to changes in delay and throughput across an internet.

15. __________ services do not provide QoS on the basis of flows but rather on the basis of the needs of different groups of users.

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

CHAPTER 12: LAN ARCHITECTURE AND INFRASTRUCTURE

TRUE OR FALSE 1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

F T T F F T F T F T T T F T T

MULTIPLE CHOICE 1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

D A A B D B A D C B A D C A D

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

SHORT ANSWER 1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

backend SAN (Storage Area Network) cost LAN mainframes transmission medium guided media wireless transmission shielded ILD (injection laser diode) structured cabling systems PDU (Protocol Data Unit) LLC (Logical link control) Wiring closets 100 m

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

CHAPTER 12: LAN ARCHITECTURE AND INFRASTRUCTURE TRUE OR FALSE T

F

1. Even for large companies, isolated personal computers are often more than sufficient for current computer based tasks.

T

F

2. One of the advantages of having a bottom up approach to building a LAN is that individual managers are very close to the group and therefore understand the needs of the department and can respond quickly.

T

F

3. One of the challenges when adopting a top down design approach to networks is that the company must understand the individual needs of each department and be responsive.

T

F

4. Back-end networks are used in situations where a few large computers must be connected for low-volume data transfers.

T

F

5. A Storage Area Network (SAN) is a network specifically designed to allow specific servers the ability to share local storage devices with each other.

T

F

6. One rationale for not employing Local Area Network (LAN) technology for an entire premise is because there are differing levels of equipment, such as PCs, servers, and mainframes.

T

F

7. Twisted pair wires are immune from all interference due to electromagnetic coupling because of the twisting of the wires.

T

F

8. Coaxial cable is less susceptible to electromagnetic interference, but more expensive, when compared with twisted pair cables.

T

F

9. The major difference between Category 3 UTP and Category 5 UTP is that the latter uses a larger sized wire for the conductors.

T

F

10. The capacity of optical fiber cable is more than 1000 times greater than coaxial cables.

T

F

11. The requirement for networking capability within the individual building is just as strong as the requirement for wide area networking.

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

T

F

12. A LAN consists of a shared transmission medium and a set of hardware and software for interfacing devices to the medium and regulating the orderly access to the medium.

T

F

13. LAN protocol architectures are more concerned with cabling infrastructure and less concerned with providing services needed by network attached devices to share the LAN transmission medium.

T

F

14. Guided media provide a physical path along which the signals are propagated; these include twisted pair, coaxial cable, and optical fiber.

T

F

15. Traditionally, twisted pair has been the workhorse for communications of all sorts.

MULTIPLE CHOICE 1. Which of the following is NOT one of the typical characteristics of back-end networks?

A. high data rate

B. high-speed interface

C. distributed access

D. extended distance

2. Problems with using a single Local Area Network (LAN) to interconnect devices on a premise include: A. insufficient reliability, limited capacity, and inappropriate network interconnection devices B. insufficient reliability, limited capacity, and limited distances C. insufficient reliability, limited distances, and inappropriate network interconnection devices D. limited distances, limited capacity, and inappropriate network interconnection devices

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

3. Which of following is NOT one of the designs that determines data rate and distance?

A. the number of senders

B. the number of receivers

C. transmission impairment

D. bandwidth

4. The fact that signal strength falls off with distance is called ________________.

A. bandwidth

B. attenuation

C. resistance

D. propagation

5. Which of the following is NOT one of the distinguishing characteristics for optical fiber cables compared with twisted pair or coaxial cables?

A. greater capacity

B. lower attenuation

C. electromagnetic isolation

D. heavier weight

6. Which of the following is NOT one of the characteristics of a building wiring scheme using a structured cabling system?

A. the scheme refers to the wiring within a commercial building B. the scheme must accommodate the need for separate cabling systems for each of data, voice, and video applications C. the scope of the system includes cabling to support of all types of information transfer, including voice, LANs, video and image transmission, and other forms of data transmission D. the cable layout is designed to encompass distribution to all work areas within the building, so that relocation of equipment does not require rewiring but simply requires plugging the equipment into a preexisting outlet in the new location 7. When examining a MAC frame of data, starting with the first bit, which of the following describes the order of the various headers found in the frame?

A. MAC, LLC, IP, and TCP

B. TCP, IP, MAC, and LLC

C. TCP, IP, LLC, and MAC

D. MAC, IP, TCP, and LLC

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

8. Which of the following is a characteristic of a backend network?

A. high data rate

B. distributed access

C. limited distance

D. all of the above

9. A ___________ is a separate network to handle storage needs.

A. NAN

B. LAN

C. SAN

D. MAC

10. Cables and associated connecting hardware whose transmission characteristics are specified up to _________ fall into Category 5 UTP cabling.

A. 50 MHz

B. 100 MHz

C. 150 MHz

D. 200 MHz

11. The lowest layer of the IEEE 802 reference model corresponds to the ____________ of the OSI model and includes such functions as encoding/decoding of signals and bit transmission/reception.

A. physical layer

B. logic layer

C. link layer

D. control layer

12. A service provided as an alternative for attached devices using LLC is: A. unacknowledged connectionless service B. connection-mode service C. acknowledged connectionless service D. all of the above 13. The function of a __________ protocol is to control access to the transmission medium and to provide an orderly and efficient use of that capacity.

A. LLC

B. SAN

C. MAC

D. MAN

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

14. In most _______________ protocols, the data link protocol entity is responsible not only for detecting errors using the CRC, but for recovering from those errors by retransmitting damaged frames.

A. data link control

B. logical link control

C. media access control

D. all of the above

15. A design factor relating to the transmission medium and the signal to determine the data rate and distance is: A. bandwidth

B. transmission impairments

C. interference

D. all of the above

SHORT ANSWER 1. Sometimes called computer room networks, __________ networks are used to interconnect large systems such as mainframes, supercomputers, and mass storage devices that typically need to transfer large volumes of data between one another.

2. A __________ can be described as a separate network of storage devices that are physically removed from, but still connected to, the network.

3. Drawbacks to a single-LAN strategy are: reliability, capacity, and _________.

4. A factory ________ should be: of high capacity, able to handle a variety of data traffic, capable of having a large geographic footprint, highly reliable, and able to specify and control transmission delays.

5. The kinds of data processing equipment to be supported in a typical business organization can be grouped into three categories: personal computers and workstations, server farms, and _________.

6. In a data transmission system, the __________ is the physical path between transmitter and receiver.

7. With __________, the waves are guided along a solid medium, such as copper twisted pair, copper coaxial cable, or optical fiber.

8. The atmosphere and outer space are examples of unguided media, which provide a means of transmitting electromagnetic signals but do not guide them; this form of transmission is usually referred to as ___________.

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

9. Twisted pair comes in two varieties: unshielded and _________.

10. Two different types of light source are used in fiber optic systems: LED and __________.

11. To aid in the development of cabling plans, standards have been issued that specify the cabling types and layout for office, data center, and apartment buildings; these standards are referred to as __________.

12. Higher-level data, such as an IP datagram, are passed down to LLC, which appends control information as a header, creating an LLC ___________.

13. __________ is a common link protocol for all LANs and specifies the mechanisms for addressing stations across the medium and for controlling the exchange of data between two users.

14. __________ are the termination points for all of the cabling and where the networking equipment will be located.

15. Ethernet requires that each segment be no more than ___________ in length, including the installed cabling and patch cables at either end, for 10-Mbps and 100-Mbps transmissions.

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

CHAPTER 13: ETHERNET, SWITCHES, AND VIRTUAL LANS

TRUE OR FALSE 1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

F F F T T F F T T T F T T T T

MULTIPLE CHOICE 1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

D C D C B A C A A A B C A D B

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

SHORT ANSWER 1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

Fibre Channel Ethernet Bus topology collision Pad MAC Client Data bridge collision hub star cut-through switch broadcast storm Fast Ethernet domain VLAN (virtual LAN)

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

CHAPTER 13: ETHERNET, SWITCHES, AND VIRTUAL LANS

TRUE OR FALSE T

F

1. Network topology refers to the way individual end stations access the network prior to transmission of user data.

T

F

2. The original commercial Ethernet, as well as the original IEEE 802.3 standard, operated at 100 Mps.

T

F

3. On a bus topology LAN, each station can send and receive data to or from another station independent of other bus activity.

T

F

4. A MAC frame includes various bit patterns to enable a receiver to correctly recognize key parts of the information contained in the frame.

T

F

5. In the MAC frame, the start of frame delimited (SFD) provides the receiver with the starting point of meaningful data in the frame.

T

F

6. Every MAC frame must include two addresses, which allows an alternative receiver to be designated in the event an error occurs.

T

F

7. Two general approaches to connecting multiple LANs are bridges and switches.

T

F

8. In general, the performance of a LAN declines with increased lengths of connections and/or the number of devices using it.

T

F

9. Because of increased functionality of modern layer 2 switches, bridges have been replaced by these types of switches.

T

F

10. A broadcast recipient address means that all devices connected to the LAN are to receive the message.

T

F

11. A layer 3 switch is just another name for a router.

T

F

12. One simple approach to improving efficiency is to physically partition the LAN into separate broadcast domains.

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

T

F

13. VLANs provide the ability for any organization to be physically dispersed throughout the company while maintaining its group identity.

T

F

14. PoE makes it possible to distribute both power and data using Ethernet cabling.

T

F

15. The strength of Ethernet lies in its backward compatibility, industry support, and simplicity.

MULTIPLE CHOICE 1. Which of the following LAN technologies has the highest capacity?

A. Ethernet

B. Fast Ethernet

C. Fibre Channel

D. Gigabit Ethernet

2. Which of the following is not one of the speeds found in a modern Ethernet LAN? A. 10 Mbps

B. 100 Mbps

C. 100 Gbps

D. 10 Gbps

3. The frame format for the 802.3 protocol consists of: A. preamble

B. SFD

C. destination address

D. all of the above

4. A seven-octet pattern of alternating 0s and 1s used by the receiver to establish bit synchronization is a ________.

A. source address

B. start frame delimiter

C. preamble

D. destination address

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

5. The sequence 10101011, which indicates the actual start of the frame and enables the receiver to locate the first bit of the rest of the frame, is the ______.

A. FCS

B. SFD

C. DA

D. SA

6. The _________ specifies the station(s) for which the frame is intended. It may be a unique physical address, a group address, or a broadcast address.

A. DA

B. SA

C. SFD

D. preamble

7. The _________ specifies the station that sent the frame.

A. MAC client data

B. SFD

C. SA

D. FCS

8. The __________ is a 32-bit cyclic redundancy check (CRC), based on all fields except preamble, SFD, and FCS. A. FCS

B. extension

C. SFD

D. none of the above

9. Routing takes place at the ___________ layer.

A. network

B. link

C. data control

D. physical

10. In general, performance on a LAN _________ with an increase in the number of devices or the length of the wire.

A. increases

B. decreases

C. fluctuates

D. does not change

11. _________ makes it possible to distribute both power and data using Ethernet cabling.

A. VLAN

B. PoE

C. MAC

D. CSMA

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

12. This long-wavelength option supports duplex links of up to 550 m of 62.5-μm or 50-μm multimode fiber or up to 5 km of 10-μm single mode fiber. Wavelengths are in the range of 1270–1355 nm.

A. 1000BASE-SX

B. 1000BASE-T

C. 1000BASE-LX

D. 1000BASE-CX

13. This short-wavelength option supports duplex links of up to 275 m using 62.5-μm multimode or up to 550 m using 50-μm multimode fiber.

Wavelengths are in the range of 770–860 nm.

A. 1000BASE-SX

B. 1000BASE-T

C. 1000BASE-LX

D. 1000BASE-CX

14. This option supports 1-Gbps links among devices located within a single room or equipment rack, using copper jumpers (specialized STP cable that spans no more than 25 m). Each link is composed of a separate STP running in each direction.

A. 1000BASE-SX

B. 1000BASE-T

C. 1000BASE-LX

D. 1000BASE-CX

15. This option makes use of four pairs of Category 5 UTP to support devices over a range of up to 100 m.

A. 1000BASE-SX

B. 1000BASE-T

C. 1000BASE-LX

D. 1000BASE-CX

SHORT ANSWER 1. ___________ provides a low-cost, easily scalable approach to achieving very high data rates and is used in storage area networks (SANs) and for other types of storage networking.

2. The most widely used high-speed LANs in today’s enterprise networks are referred to as _________ and were developed by the IEEE 802.3 standards committee.

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

3. In a _________ LAN, all stations attach, through appropriate hardware interfacing known as a tap, directly to a linear transmission medium, or bus.

4. It may happen that two or more stations attempt to transmit at about the same time; if this happens, there will be a _________ .

5. A _________ is octets added to ensure that the frame is long enough for proper CD operation.

6. The __________ is a data unit supplied by LLC. The maximum size of this field is 1500 octets for a basic frame, 1504 octets for a Q-tagged frame, and 1982 octets for an envelope frame.

7. A _________ provides a means of interconnecting similar LANs. 8. Segmenting a larger network into ___________ domains can help to prevent a fault in one network segment from affecting the entire network.

9. A _________ is an alternative to the bus topology, connects with a transmit and receive line, and acts as a repeater.

10. A hub uses a ________ wiring arrangement to attach stations to the hub.

11. Two major types of layer 2 switches are available for use in business networks: store-and-forward switch and ____________.

12. A malfunctioning device can create a _________ , in which numerous broadcast frames clog the network and crowd out legitimate traffic.

13. ___________ refers to a set of specifications developed by the IEEE 802.3 committee to provide a low-cost, Ethernet-compatible LAN operating at 100 Mbps.

14. The total collection of devices that receive broadcast frames from each other is referred to as a broadcast _________ .

15. A _________ is a logical subgroup within a LAN that is created by software rather than by physically moving and separating devices.

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

CHAPTER 14: WIRELESS LANS

TRUE OR FALSE 1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

T T F F F T F F F F F T T T T

MULTIPLE CHOICE 1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

A D B B B C D A B C B A D B C

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

SHORT ANSWER 1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

BSS (basic service set) IBSS (independent BSS) ESS (extended service set) Distribution integration disassociation security DFWMAC (distributed foundation wireless MAC) MIMO (Multiple-input-multiple-output) Li-Fi Consortium WEP (Wired Equivalent Privacy) WPA (Wi-Fi Protected Access) infrared IEEE 802.11 station

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

CHAPTER 14: WIRELESS LANS

TRUE OR FALSE T

F

1. LAN Extension is an application of wireless technology in situations where it may be used as an alternative to installing additional wired LAN.

T

F

2. Wireless LAN applications typically employ control modules that link wireless LANs to wired LANs.

T

F

3. A wireless LAN is easier than wired LANs because there are fewer requirements for capacity and connectivity.

T

F

4. The typical coverage area for a wireless LAN is 300 to 500 meters.

T

F

5. One advantage of wireless LAN use is that any transmission frequency can be used as long as it does not interfere with other nearby applications.

T

F

6. When using wireless network, roaming occurs when a mobile stations moves from one access point (or cell) to another.

T

F

7. Infrared LANs are an economic alternative to spread spectrum LANs.

T

F

8. The two frequency bands typically used by IEEE 802.11 wireless networks are located approximately at 900 MHz and 2.4 GHz.

T

F

9. Typical ranges (distance between sender and receiver) for a wireless LAN are of the order 100 to 1000 meters.

T

F

10. When using a wireless LAN with a notebook computer, it is necessary for the computer not to move while the connection is active.

T

F

11. Bluetooth is an alternative name for WIFI.

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

T

F

12. A significant problem when using wireless LANs or Bluetooth arises because other applications use the same frequency bands, which causes interference problems.

T

F

13. The key advantages of the WLAN are that it eliminates the wiring cost and it accommodates mobile workstations.

T

F

14. A basic rule of thumb for radio-based communication is that the higher the frequency, the shorter the transmission distance.

T

F

15. Another rule of thumb is that as the frequency increases, the easier it is to disrupt the signal.

MULTIPLE CHOICE 1. A basic service set (BSS) is: A. the smallest building block of a wireless LAN B. the same as an access point C. the same as a control module D. always connected to a backbone distribution system 2. IEEE 802.11 defines a number of services that need to be provided by wireless LAN to provide functionality. Which of the following is not one of these services?

A. Association

B. Reassociation

C. Authentication

D. Coordination

3. A typical coverage area for a WLAN has a diameter of _________.

A. 25 – 50 m

B. 100–300 m

C. 150 – 250 m

D. 200 – 300 m

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

4. IEEE 802.11 defines _______ services that need to be provided by the WLAN to achieve functionality equivalent to that which is inherent to wired LANs. A. ten

B. nine

C. eight

D. seven

5. A station of this type either is stationary or moves only within the direct communication range of the communicating stations of a single BSS. A. ISS transition

B. no transition

C. BSS transition

D. ESS transition

6. This is defined as a station movement from one BSS to another within the same ESS. In this case, delivery of data to the station requires that the addressing capability be able to recognize the new location of the station.

A. ISS transition

B. no transition

C. BSS transition

D. ESS transition

7. This is defined as a station movement from a BSS in one ESS to a BSS within another ESS. This case is supported only in the sense that the station can move. Maintenance of upper-layer connections supported by 802.11 cannot be guaranteed. In fact, disruption of service is likely to occur.

A. ISS transition

B. no transition

C. BSS transition

D. ESS transition

8. Before a station can transmit or receive frames on a WLAN, its identity and address must be known. For this purpose, a station must establish a(n) _________ with an AP within a particular BSS. A. Association

B. Reassociation

C. Disassociation

D. all of the above

9. _________ enables an established association to be transferred from one AP to another, allowing a mobile station to move from one BSS to another.

A. Association

B. Reassociation

C. Disassociation

D. all of the above

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

10. ________ is a notification from either a station or an AP that an existing association is terminated.

A. Association

B. Reassociation

C. Disassociation

D. all of the above

11. The physical layer for IEEE 802.11 has been issued in _______ stages.

A. 3

B. 5

C. 7

D. 9

12. Any entity that has station functionality and provides access to the distribution system via the wireless medium for associated stations.

A. access point

B. basic service set

C. extended service set

D. coordination function

13. The logical function that determines when a station operating within a BSS is permitted to transmit and may be able to receive PDUs. A. access point

B. basic service set

C. extended service set

D. coordination function

14. A set of one or more interconnected BSSs and integrated LANs that appear as a single BSS to the LLC layer at any station associated with one of these BSSs. A. MPDU

B. ESS

C. MSDU

D. DS

15. Information that is delivered as a unit between MAC users.

A. MPDU

B. ESS

C. MSDU

D. DS

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

SHORT ANSWER 1. The smallest building block of a WLAN is a __________, which consists of some number of stations executing the same MAC protocol and competing for access to the same shared wireless medium.

2. When all the stations in the BSS are mobile stations, with no connection to other BSSs, the BSS is called an ___________.

3. An ___________consists of two or more BSSs interconnected by a distribution system.

4. __________ is the primary service used by stations to exchange MAC frames when

the frame must traverse the DS to get from a station in one BSS to a station in another BSS.

5. The _________ service enables transfer of data between a station on an IEEE 802.11 LAN and a station on an integrated IEEE 802.x LAN. 6. A station must maintain an association with the AP within its current BSS. Three services relate to this requirement: association, reassociation, and ___________.

7. The IEEE 802.11 MAC layer covers three functional areas: reliable data delivery, access control, and _________.

8. The end result for 802.11 is a MAC algorithm called __________ that provides a distributed access control mechanism with an optional centralized control built on top of that.

9. __________ antenna architecture is the most important of the enhancements provided by 802.11n.

10. In October of 2011, a number of companies and industry groups formed the __________, whose objective is to promote high-speed optical wireless systems.

11. For privacy , 802.11 defined the __________ algorithm.

12. In order to accelerate the introduction of strong security into WLANs, the Wi-Fi Alliance promulgated ____________ as a Wi-Fi standard. This set of security mechanisms eliminates most 802.11 security issues and was based on the current state of the 802.11i standard.

13. WLANs use one of three transmission techniques: spread spectrum, narrowband microwave, and __________.

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

14. The most significant set of standards defining WLANs are those defined by the ___________ committee.

15. A __________ is any device that contains an IEEE 802.11 conformant MAC and physical layer.

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

CHAPTER 15: WAN TECHNOLOGY AND PROTOCOL

TRUE OR FALSE 1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

F T F T F T T T T F F F T T T

MULTIPLE CHOICE 1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

D B A A D C A B C D A D C B D

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

SHORT ANSWER 1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

communications packet data transfer PBX (private branch exchange) trunks Control signals Address call information Network management datagram virtual circuit value-added network (VAN) Strategic control Growth control VoIP

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

CHAPTER 15: WAN TECHNOLOGY AND PROTOCOL TRUE OR FALSE T

F

1. In most networks, not every sender/receiver pair can be connected.

T

F

2. Switching nodes are devices that enable data to be moved from senders to receivers.

T

F

3. It is desirable to have only one path from sender to receiver to avoid excess costs.

T

F

4. Having multiple paths from one station to another through a network contributes to reliability.

T

F

5. Almost all wide area networks use circuit switching.

T

F

6. The public telephone network is a good example of a circuit switched network.

T

F

7. In a circuit switching network, the path that will be used through the network is determined prior to any data transfer.

T

F

8. Use of digital transmission for applications such as telephone requires that a dedicated connection be established across the network.

T

F

9. In circuit switching networks, channel capacity between each pair of stations and/or nodes along the connection path must be reserved regardless if used or not.

T

F

10. The major application that uses circuit switching networks is the telephone system, thus most data transferred using this type of network is voice traffic.

T

F

11. Interconnection of computer systems is not reliable when using circuit switched networks.

T

F

12. Basic packet switching technology has recently been developed to replace circuit switching.

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

T

F

13. The choice between circuit and packet switching depends on a host of considerations, including cost, performance, reliability, and flexibility.

T

F

14. For communications outside the range of a single building or a cluster of buildings, a wide area network (WAN) is employed.

T

F

15. Presence information is associated with every presentity in the system and is maintained by the presence service.

MULTIPLE CHOICE 1. Data communications via circuit switching involves three phases: A. connect, transfer, hang-up B. ring, talk, hang-up C. dial, transfer, disconnect D. establishment, data transfer, disconnect 2. A public telecommunications network can be described using four generic components: A. senders, receivers, lines, and nodes B. subscribers, local loops, exchanges, and trunks C. subscribers, trunks, nodes, and loops D. local loops, subscriber lines, exchanges, and trunks 3. Which of the following is NOT one of classes of function for control signaling?

A. establishment

B. supervisory

C. call information

D. network management

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

4. Which of the following is NOT one of the stated advantages of packet switching over circuit switching?

A. there is less network delay

B. data rate conversion can be provided

C. priorities can be used

D. connections are never rejected

5. Which of the following is NOT a reason for network jitter when using packet switching networks?

A. packets may vary in length B. packets may take different paths through the network C. packets may encounter network congestion D. data rates will vary from one trunk line to the next 6. In a __________ network , data entering the network from a station are routed to the destination by being switched from node to node.

A. packet switching

B. simple switching

C. switched communication

D. all of the above

7. _______ are the devices that attach to the network.

A. Subscribers

B. Subscriber line

C. Exchanges

D. Trunks

8. The ________ is the link between the subscriber and the network, also referred to as the subscriber loop or local loop.

A. subscribers

B. subscriber line

C. exchanges

D. trunks

9. ________ are the switching centers in the network.

A. Subscribers

B. Subscriber line

C. Exchanges

D. Trunks

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

10. ________ are the branches between exchanges.

A. Subscribers

B. Subscriber line

C. Exchanges

D. Trunks

11. The heart of the call placement process for VoIP is the ___________, defined in RFC 3261, which is an application-level control protocol for setting up, modifying, and terminating real-time sessions between participants over an IP data network.

A. SIP

B. SDP

C. PDP

D. POP

12. Which of the following is a feature of Wide Area Networks?

A. strategic control

B. reliability

C. security

D. all of the above

13. Which of the following is a disadvantage of circuit switching?

A. delay

B. complex routing and control

C. requires subscriber compatibility

D. all of the above

14. Which of the following is an advantage of circuit switching?

A. provides speed conversion

B. compatible with voice

C. appears nonblocking

D. logical multiplexing

15. An advantage of packet switching over circuit switching is: A. line efficiency is better B. priorities can be used C. can carry out data-rate conversion D. all of the above

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

SHORT ANSWER 1. Each station attaches to a node, and the collection of nodes is referred to as a ________ network 2. Two different technologies are used in wide area switched networks: circuit switching and _________ switching.

3. Communication via circuit switching involves three phases: circuit establishment, ________, and circuit disconnect.

4. Another well-known application of circuit switching is the _________ used to interconnect telephones within a building or office.

5. A public telecommunications network can be described using four generic architectural components: subscribers, subscriber line, exchanges, and _________.

6. ________ are the means by which the network is managed and by which calls are established, maintained, and terminated.

7.

________ signals identify a subscriber.

8. The term ________ refers to those signals that provide information to the subscriber about the status of a call.

9.

_________ signals are used for the maintenance, troubleshooting, and overall operation of the network.

10. In the _________ approach, each packet is treated independently, with no reference to packets that have gone before.

11. In the _________ approach, a preplanned route is established before any packets are sent.

12. Typically, the network provider owns a set of packet-switching nodes and links these together with leased lines provided by a carrier such as AT&T. Such a network is called a ________ , reflecting the fact that the network adds value to the underlying transmission facilities.

13. _________ involves the process of designing and implementing the network to meet the organization’s unique requirements.

14. __________ allows users to plan for network expansion and modifications arising as their needs change.

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

15. With ________, the calling user (program or individual) supplies the phone number of a URI (Universal Resource Indicator, a form of URL), which then triggers a set of protocol interactions resulting in the placement of the call.

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

CHAPTER 16: WAN SERVICES TRUE OR FALSE 1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

F F F T T T T F T F F T T T T

MULTIPLE CHOICE 1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

D B C C D A D B B A B D C A D

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

SHORT ANSWER 1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

Wide area Ethernet (WAE) virtual private LAN services (VPLS) Carrier Ethernet Metro Ethernet Multiprotocol label switching (MPLS) Point-to-point (Pseudowire) Ethernet Wide area Ethernet (WAE) avoidance recovery Backward explicit congestion notification (BECN) Forward explicit congestion notification (FECN) Discard eligibility (DE) virtual channels virtual path

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

CHAPTER 16: WAN SERVICES TRUE OR FALSE T

F

1. Selecting a WAN protocol for a particular business is a fairly simple task given current pricing structures and business traffic patterns.

T

F

2. Traffic leaving a network or internal telephone system is separated into different lines and then sent to the service provider.

T

F

3. X.25 uses out-of-band signaling.

T

F

4. Frame Relay is a more streamlined communication process than X.25.

T

F

5. In Frame Relay systems congestion control is the responsibility of both end users and the network.

T

F

6. Congestion recovery procedures are used to preserve the network during instances of high congestion when the network has begun to drop frames.

T

F

7. Congestion avoidance procedures are employed when congestion starts to build up and increasing queue lengths are detected.

T

F

8. Frames whose discard eligibility is set due to committed information rates are less likely to be removed from the network.

T

F

9. The cell loss priority within the ATM cell is similar to the DE bit in Frame Relay.

T

F

10. One of the reasons for ATMs high rate of speed is the fact that the protocol does no pre-connection setup and therefore there is no delay.

T

F

11. Due to the fixed cell size, the processing of ATM cells is faster than protocols employing a variable length cell.

T

F

12. Because of the high speeds involved and the small amount of overhead, when compared to Frame Relay, congestion control in ATM networks is more complex.

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

T

F

13. ATM provides a flexible set of traffic control mechanisms that are based on the type of user data.

T

F

14. Carrier Ethernet often capitalizes on the existence of optical fiber and dense wavelength division multiplexing (DWDM) infrastructure to provide WAN and MAN services to subscribers.

T

F

15. MPLS is often described as being “protocol agnostic” because it can carry many different kinds of traffic.

MULTIPLE CHOICE 1. The inability of frame relay to do hop by hop error control is offset by: A. its gigabit speeds B. its high overhead C. the extensive use of in-band signaling D. the increasing reliability of networks 2. All of the following are part of the LAPF core except: A. frame delimiting

B. error correction

C. frame correction

D. congestion control

3. All Frame Relay nodes contain which of the following protocols?

A. LAPB

B. LAPD

C. LAPF Core

D. LAPF Control

4. The technique employed by Frame Relay is called __________.

A. inband signaling

B. outband signaling

C. common channel signaling

D. open shortest path first routing

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

5. The data contained within the Frame Relay address field is the _________.

A. MAC address

B. virtual circuit identifier

C. IP number

D. data link connection identifier

6. Systems using common channel signaling: A. employ a separate virtual channel for connection setup B. carry connection information within each frame C. use an expanded control field D. do not use channels 7. Which of the following lists the items in order such that the associated channel capacities are increasing?

A. ATM, X.25, Frame Relay, and ISDN B. ISDN, ATM, Frame Relay, and X.25 C. ATM, Frame Relay, ISDN, and X.25 D. X.25, ISDN, Frame Relay, and ATM 8. In ATM, the basic transmission unit is the ________.

A. frame

B. cell

C. packet

D. segment

9. The ATM connections are identified by: A. virtual paths within data link identifiers B. virtual channels within virtual paths C. virtual circuits within virtual paths D. virtual circuits within data link identifiers

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

10. When using ATM, which of the following is NOT one of the advantages for the use of virtual paths?

A. less work is needed to set a virtual path B. the network architecture is simplified C. the network performance and reliability is enhanced D. channel connection setup times are reduced 11. When using ATM, which of the following is NOT a characteristic of virtual channel connections?

A. quality of service can be specified B. all connections are switched C. sequencing is provided D. traffic patterns can be monitored 12. Which of the following are WAN protocols?

A. Frame Relay

B. T-1

C. SONET

D. all of the above

13. Which of the following are LAN protocols?

A. X.25

B. ATM

C. Token Ring

D. all of the above

14. The _________ field indicates the type of information in the information field.

A. PT

B. VPI

C. GFC

D. CRC

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

15. Public switched services include which of the following?

A. ISDN

B. WAE

C. dial-up/modem

D. all of the above

SHORT ANSWER 1. __________ is the delivery of WAN services using Ethernet connectivity and is a high-speed alternative to traditional WAN services such as frame relay, leased lined, ATM, or T-1 services.

2. Most WAE implementations use __________to interconnect network endpoints.

3. __________ services are deployed in several ways, including conventional Ethernet, Ethernet over SDH (Synchronous Digital Hierarchy), and Ethernet over MPLS. 4. The use of Carrier Ethernet technologies to create metropolitan area networks (MANs) is most commonly called _________.

5. ____________ directs data from one network node to the next based on short path labels rather than longer IP network addresses.

6. There are three major types of MPLS VPNs deployed in today’s networks: Layer 2 (VPLS), Layer 3 (VPRN), and ___________.

7. WAE uses _________ connectivity to deliver high-speed WAN service.

8. Basically a VPN that simplifies linking Ethernet LANs at remote locations, _________ is marketed as an alternative to traditional WAN services such as T1, leased lines, and frame relay.

9. Congestion _________ procedures are used at the onset of congestion to minimize the effect on the network.

10. Typically initiated when the network has begun to drop frames due to congestion, congestion _________ procedures are used to prevent network collapse in the face of severe congestion.

11. _____________notifies the user that congestion avoidance procedures should be initiated where applicable for traffic in the opposite direction of the received frame.

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

12. ___________ notifies the user that congestion avoidance procedures should be initiated where applicable for traffic in the same direction as the received frame.

13. __________ indicates a request that a frame should be discarded instead of other frames in which this bit is not set, when it is necessary to discard frames.

14. Logical connections in ATM are referred to as __________.

15. A _________ is a bundle of virtual channels that have the same endpoints.

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

CHAPTER 17: WIRELESS LANS TRUE OR FALSE 1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

T F T T T F F F F T F T T T F

MULTIPLE CHOICE 1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

A C C A D B D B C D A B A D D

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

SHORT ANSWER 1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

personal digital assistant (PDA) traffic Wireless Application Protocol (WAP) third space division multiple access (SDMA) Advanced Mobile Phone System(AMPS) handoff microcells cell sectoring stations uplink downlink transponder geostationary earth orbit satellite (GEOS) MEOSs

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

CHAPTER 17: WIRELESS LANS TRUE OR FALSE T

F

1. Wireless networks are more susceptible than wired networks to interference, signal loss, noise, and eavesdropping.

T

F

2. Wireless networks compete effectively in terms of data transfer rates when compared with wired networks.

T

F

3. When using wireless networks, there are limitations on which frequencies can be used for the channels.

T

F

4. When using wireless systems, you are limited in how often you can use the same frequency band for different communications because the signals are not constrained and can interfere with each other even when separated geographically.

T

F

5. In cellular communications systems, base stations (BS) are located in the geographic center of cells and handle communications between mobile units and the rest of the network.

T

F

6. Each mobile telecommunications switch office is connected to one base station and provides a management interface between that base station and the rest of the network.

T

F

7. The specific base station that communicates with the mobile unit is selected by the MTSO based on the strength of the signal received from the mobile unit.

T

F

8. The base station selected for communication with a mobile unit is always the one closest to the current location of the unit.

T

F

9. First generation mobile telephone systems used analog voice communication based on amplitude modulation.

T

F

10. The objective of the third generation of wireless communication is to provide high-speed wireless communications to support multimedia, data, and video, in addition to voice.

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

T

F

11. The idea of universal personal telecommunications refers to the capability of using one's terminal in a wide variety of environments to connect to information services.

T

F

12. Satellite communications is comparable in importance to optical fiber in the evolution of telecommunications and data communications.

T

F

13. In contrast to earlier generations, 4G systems do not support traditional circuit-switched telephony service.

T

F

14. In 4G networks, IP telephony is the norm as are IP packetswitched connections for Internet access.

T

F

15. 4G networks, devices, and services are expected to evolve slowly over the next decade.

MULTIPLE CHOICE 1. Prior to cellular radio, mobile radio and telephone services required: A. a high-power transmitter/receiver B. multiple transmitters/receivers C. only one or two dedicated channels D. that many channels be used, which exceed the frequency capacity 2. When using cellular networks, __________.

A. a single base station can serve multiple cells B. adjacent cells must use the same frequencies C. adjacent cells are assigned different frequencies D. non-adjacent cells are assigned different frequencies

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

3. The ideal design for cells in a cellular network is a hexagonal shape because _____.

A. this makes enforcement of shapes easier B. this is the easiest to implement C. this makes all frequencies available to all cells D. this makes the distance to all adjacent cells the same 4. When a mobile unit moves, it may connect with a different base station. This action is called ____________.

A. a handoff

B. a transfer

C. a reconfiguration

D. a dropped signal

5. Which of the following is NOT one of the ways that frequency spectrum can be divided among active users?

A. frequency division multiple access

B. time division multiple access

C. code division multiple access

D. cell division multiple access

6. Because of the limited frequencies available, a key design element of any cellular system is to ___________.

A. use small cells B. employ multiple access C. limit the number of users at one time D. use as many frequencies as possible

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

7. The Wireless Application Protocol (WAP) is: A. proprietary protocol developed in the USA for wireless security B. dependent on the specific network technologies employed C. an Internet standard that replaces HTML, HTTP, and XML D. designed to overcome many of the limitations hindering acceptance of mobile data services 8. Which of the following is NOT one of the components of the WAP specification?

A. A framework for wireless telephony applications B. A full-featured communications protocol stack C. A programming model based on the WWW D. A markup language adhering to XML 9. The WAP Programming Model uses a ________ that acts as a proxy server for the wireless domain.

A. translator

B. WAP server

C. gateway

D. decoder

10. For a given system, multiple access is based on _______.

A. TDMA

B. FDMA

C. CDMA

D. all of the above

11. Peak download rate for a 4G network is __________.

A. 1 Gbps

B. 100 Mbps

C. 500 Mbps

D. 384 kbps

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

12. Peak download rate for a 3G network is _________.

A. 1 Gbps

B. 100 Mbps

C. 500 Mbps

D. 384 kbps

13. _________ was developed to address the limitations of cellular and other wireless networks for providing data services to mobile devices.

A. WAP

B. Droid

C. GEOS

D. WML

14. A primary multiple access scheme used in cellular telephony is __________.

A. FDMA

B. TDMA

C. CDMA

D. all of the above

15. Wireless communications is likely to be viewed as an essential part of an enterprise network infrastructure when: A. Mobile communication is needed B. Communication must take place in a hostile or difficult terrain that makes wired communication difficult or impossible C. Communication facilities must be installed at low initial cost D. The same information must be broadcast to many locations

SHORT ANSWER 1. A __________ is a mobile device that mobile workers can use as a personal information manager.

2. The two types of channels that are available between the mobile unit and the base station are control and ___________.

3. The ____________ is a universal, open standard developed by the WAP Forum to provide mobile users to access telephony and information services including the Internet and the Web.

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

4. The objective of the __________ generation of wireless communication is to provide fairly high-speed wireless communications to support multimedia, data, and video in addition to voice.

5. There are basically four ways to divide the spectrum among active users: frequency division multiple access (FDMA), time division multiple access (TDMA), code division multiple access (CDMA), and ______________.

6. A widely used first-generation system was the ______________, which was widely used in North and South America, Australia, and China through the 1980s and into the 2000s.

7. As mobile units move, they pass from cell to cell, which requires transferring of the call from one base transceiver to another; this process is called a __________ .

8. As cells become smaller, antennas move from the tops of tall buildings or hills, to the tops of small buildings or the sides of large buildings, and finally to lamp posts, where they form ___________.

9. With ____________, a cell is divided into a number of wedge shaped sectors, each with its own set of channels, typically three or six sectors per cell.

10. The antenna systems on or near the earth are referred to as earth _________ .

11. A transmission from an earth station to the satellite is referred to as __________.

12. Transmissions from the satellite to the earth station are __________.

13. The electronics in the satellite that takes an uplink signal and converts it to a downlink signal is called a _________ .

14. The most common type of communications satellite today is the _________, first proposed by the science-fiction author Arthur C. Clarke in 1945.

15. ___________ have the following characteristics: • Circular orbit at an altitude in the range of 5000–12,000 km.

• The orbit period is about 6 hours.

• The diameter of coverage is from 10,000 to 15,000 km.

• Round-trip signal propagation delay is less than 50 ms.

• The maximum time that the satellite is visible from a fixed point on earth (above the radio horizon) is a few hours.

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

CHAPTER 18: COMPUTER AND NETWORK SECURITY THREATS TRUE OR FALSE 1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

F T T F F F T F T T T F T T T

MULTIPLE CHOICE 1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

D A B C D D B D D B D A C C D

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

SHORT ANSWER 1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

Computer Security availability Confidentiality availability integrity inference intrusion Falsification Passive attacks Active attacks logic bomb worm bot (robot) stealth virus Mobile code

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

CHAPTER 18: COMPUTER AND NETWORK SECURITY THREATS TRUE OR FALSE T

F

1. Data confidentiality assures that individuals control or influence what information related to them may be collected and stored.

T

F

2. The three key objectives of computer security are confidentiality, integrity, and availability.

T

F

3. Repudiation refers to a user either denying sending data or a user denying receiving or possessing the data.

T

F

4. Traffic analysis is an active attack.

T

F

5. A masquerader is a legitimate user who accesses data, programs, or resources for which such access is not authorized.

T

F

6. All parasitic malware is software that replicates.

T

F

7. A backdoor is the same as a trapdoor.

T

F

8. A logic bomb is a useful, or apparently useful, program or command procedure containing hidden code that, when invoked, performs some unwanted or harmful function.

T

F

9. Most viruses carry out their work in a manner that is specific to a particular operating system.

T

F

10. A virus can be prepended or postpended to an executable program, or it can be embedded in some other fashion.

T

F

11. A macro virus is a larger and more self-contained than an ordinary virus.

T

F

12. An encrypted virus can only be triggered after an external software program is triggered to decrypt the virus.

T

F

13. A stealth virus is explicitly designed to hide itself from detection by antivirus software.

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

T

F

14. A worm is a program that can replicate itself and send copies from computer to computer across network connections.

T

F

15. Security threats can be classified based on how a given attack provides a threat to a given objective.

MULTIPLE CHOICE 1. Important objectives of computer security include: A. confidentiality

B. integrity

C. availability

D. all of the above

2. One type of attack on the security of a computer system or network that impacts the availability of a system (e.g. destruction of a resource in the system) is referred to as ___________.

A. interruption

B. interception

C. modification

D. all of the above

3. The type of attack on communications lines and networks known as traffic analysis belongs to the general category of ____________.

A. active attacks

B. passive attacks

C. administrative attacks

D. none of the above

4. Of the three classes of intruders into computer systems and networks, the clandestine user is typically: A. an insider to the organization B. an outsider to the organization C. either an insider or an outsider to the organization D. none of the above

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

5. Which of the following is not an example of intrusion: A. guessing and cracking passwords B. running a packet sniffer on a workstation to capture user names and passwords C. using an unattended, logged-in workstation without permission D. all of the above are examples of intrusion 6. A secret entry point into a program that allows intruders aware of the breached area to gain access and bypass the usual security access procedures is called a: A. logic bomb

B. Trojan horse

C. virus

D. none of the above

7. The stage of a virus where it is activated to perform the function for which it was intended is referred to as the _________.

A. propagation phase

B. triggering phase

C. execution phase

D. none of the above

8. A virus can be attached to a program by _________.

A. prepending B. postpending C. embedding other than at the beginning or end D. all of the above 9. Which of the following statements regarding macro viruses is true?

A. a macro virus is platform independent B. macro viruses infect documents, not executable portions of code C. macro viruses are easily spread D. all of the above

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

10. Which of the following statements is generally true regarding the original class of email viruses?

A. it sends itself to selected names on the user’s email mailing list B. arrive in email attachments C. usually do no local damage on the infected machine D. all of the above 11. The network vehicle used for worm propagation is ___________.

A. electronic mail facility B. remote execution capability C. remote login capability D. all of the above 12. A worm that can attack a variety of OSs rather than a single OS such as Windows is ______________.

A. multiplatform

B. multi-exploit

C. polymorphic

D. metamorphic

13. The primary mechanism used in implementing denial-of-service attacks is the: A. worm

B. Trojan horse

C. bot

D. all of the above

14. __________ capture keystrokes on a compromised system.

A. Worms

B. Zombies

C. Keyloggers

D. All of the above

15. Which of the following is a type of scanning strategy?

A. hit list

B. topological

C. local subnet

D. all of the above

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

SHORT ANSWER 1. __________ is the protection afforded to an automated information system in order to attain the applicable objectives of preserving the integrity, availability, and confidentiality of information system resources.

2. The three concepts that form the CIA triad are: confidentiality, integrity, and ____________.

3. __________ is preserving authorized restrictions on information access and disclosure, including means for protecting personal privacy and proprietary information.

4. A loss of __________ is the disruption of access to or use of information or an information system.

5. A loss of _________ is the unauthorized modification or destruction of information.

6. An example of _________ is traffic analysis, in which an adversary is able to gain information from observing the pattern of traffic on a network, such as the amount of traffic between particular pairs of hosts on the network.

7. An example of __________ is an adversary gaining unauthorized access to sensitive data by overcoming the system’s access control protections.

8. _________ refers to the altering or replacing of valid data or the introduction of false data into a file or database.

9. _________ are in the nature of eavesdropping on, or monitoring of, transmissions. The goal of the attacker is to obtain information that is being transmitted.

10. __________ involve some modification of the data stream or the creation of a false stream and can be subdivided into four categories: replay, masquerade, modification of messages, and denial of service.

11. A _________ is code embedded in some legitimate program that is set to “explode” when certain conditions are met.

12. A _________ propagates itself and activates itself, whereas a bot is controlled from some central facility, at least initially.

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

13. Also known as a zombie or drone, a __________ is a program that secretly takes over another Internet-attached computer and then uses that computer to launch attacks that are difficult to trace to the creator.

14. A ___________ is a form of virus explicitly designed to hide itself from detection by antivirus software.

15. ___________ refers to programs (e.g., script, macro, or other portable instruction) that can be shipped unchanged to a heterogeneous collection of platforms and execute with identical semantics.

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

CHAPTER 19: COMPUTER AND NETWORK SECURITY TECHNIQUES TRUE OR FALSE 1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

F F T F F F T T T T F F T T T

MULTIPLE CHOICE 1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

B D B D B D D A D C B D A C B

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

SHORT ANSWER 1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

key management authentication confidentiality Tunnel automated message integrity Wi-Fi Protected Access (WPA) security intrusion intrusion detection analyzers Behavior-blocking software IPsec (IP security) Transport Layer Security (TLS) firewall detection

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

CHAPTER 19: COMPUTER AND NETWORK SECURITY TECHNIQUES TRUE OR FALSE T

F

1. Ipsec is based primarily upon the DES standard.

T

F

2. Transport mode in IPSec provides protection to the entire IP packet.

T

F

3. IPSec provides authentication, encryption, and key exchange functions.

T

F

4. SSL performs encryption first, followed by computing a message authentication code.

T

F

5. IEEE 802.11i consists of two main functions: authentication and access control.

T

F

6. A security intrusion is defined as a successful attempt by a user to gain access to a system or system resource without proper authorization.

T

F

7. Typically, a firewall is inserted between the premises network and the Internet to establish a controlled link and to erect an outer security wall or perimeter.

T

F

8. Generic decryption (GD) technology enables the antivirus program to easily detect even the most complex polymorphic viruses while maintaining fast scanning speeds.

T

F

9. Two important SSL concepts are the SSL session and the SSL connection.

T

F

10. Ports are logical entities defined within the authenticator and refer to physical network connections.

T

F

11. An uncontrolled port allows the exchange of PDUs between a supplicant and other systems on the LAN only if the current state of the supplicant authorizes such an exchange.

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

T

F

12. The Host-based IDS monitors network traffic for particular network segments or devices and analyzes network, transport, and application protocols to identify suspicious activity.

T

F

13. Intrusion detection is based on the assumption that the behavior of the intruder differs from that of a legitimate user in ways that can be quantified.

T

F

14. The primary benefit of a host-based IDS is that it can detect both external and internal intrusions.

T

F

15. A typical use of circuit-level gateways is a situation in which the system administrator trusts the internal users.

MULTIPLE CHOICE 1. IPSec transport mode provides protection primarily for: A. the Internet layer

B. upper-layer protocols

C. network and link-layer protocols

D. all of the above

2. The higher-layer protocols defined as part of SSL include: A. handshake protocol

B. change cipher spec protocol

C. alert protocol

D. all of the above

3. The WiFi standard known as Privacy with message integrity can be described as follows: A. a way of ensuring the privacy of the individual using WiFi B. a technique that ensures that the data transmitted using WiFi have not been altered C. a way of providing mutual authentication between a user and an AS D. none of the above

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

4. A key logical component of an IDS is: A. sensors

B. analyzers

C. user interface

D. all of the above

5. A stateful inspection firewall ________.

A. applies a set of rules to each incoming and outgoing IP packet and then forwards or discards the packet B. controls TCP traffic by creating a directory of outbound TCP connections C. acts as a relay of application-level traffic D. sets up two TCP connections, one between itself and a TCP user on an inner host and one between itself and a TCP user on an outside host 6. Which of the following is not a central element of a typical antivirus scheme?

A. detection

B. identification

C. removal

D. deterrence

7. Which of the following is a higher-layer protocol defined as part of SSL? A. the Handshake Protocol

B. the Change Cipher Spec Protocol

C. the Alert Protocol

D. all of the above

8. The most complex part of SSL is the ___________ Protocol.

A. Handshake

B. Change Cipher Spec

C. Alert

D. Record

9. Which security area is addressed in IEEE 802.11i ?

A. authentication

B. key management

C. data transfer privacy

D. all of the above

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

10. The 802.11i architecture consists of ________ main ingredients.

A. one

B. two

C. three

D. four

11. The ideal solution to the threat of viruses is: A. detection

B. prevention

C. identification

D. removal

12. __________ is a monitored behavior.

A. Attempts to open, view, delete, and/or modify files B. Attempts to format disk drives and other unrecoverable disk operations C. Modification to the logic of executable files or macros D. All of the above 13. Most organizations agree that __________ become their worst security problem.

A. their own users

B. viruses

B. intrusions

D. managers

14. At _________ the IP header is exposed and so filtering or firewalls can be applied to IP addresses.

A. layer 1

B. layer 2

C. layer 3

D. layer 4

15. A(n) __________ looks for user behavior that differs from that expected from a legitimate user.

A. ACK

B. IDS

C. SSL

D. TLS

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

SHORT ANSWER 1. IP-level security encompasses three functional areas: authentication, confidentiality, and _________.

2. The _________ mechanism assures that a received packet was, in fact, transmitted by the party identified as the source in the packet header 3. The ________________ facility enables communicating nodes to encrypt messages to prevent eavesdropping by third parties.

4. _________ mode is used when at least one of the two ends is a security gateway, such as a firewall or router, that implements IPsec.

5. The IPsec Architecture document mandates support for two types of key management: manual and ___________.

6. The SSL Record Protocol provides two services for SSL connections: confidentiality and ___________.

7. In order to accelerate the introduction of strong security into WLANs, the Wi-Fi Alliance promulgated __________ as a Wi-Fi standard.

8. A ____________ is a security event, or a combination of multiple security events, that constitutes a security incident in which an intruder gains, or attempts to gain, access to a system (or system resource) without having authorization to do so.

9. A __________ is a security service that monitors and analyzes system events for the purpose of finding, and providing real-time or near-real-time warning of, attempts to access system resources in an unauthorized manner.

10. An IDS comprises three logical components: sensors, user interface, and _______.

11. ____________ integrates with the operating system of a host computer and monitors program behavior in real time for malicious actions and then blocks potentially malicious actions before they have a chance to affect the system.

12. ___________ is a set of protocols for providing encryption, authentication, and key management for IP. 13. The Secure Sockets Layer (SSL) and the follow-on Internet standard known as __________ provide a reliable end-to-end secure transport service over TCP.

Business Data Communications Infrastructure, Networking, and Security, 7th Edition, by William Stallings and Tom Case

14. A _________ is a hardware or software entity inserted between a system or network to be protected and the Internet or other outside access network to control traffic in both directions to enforce a security policy.

15. Malware defense can involve a combination of prevention, __________, and removal.