Computer Networks
Pre-Test Questions
Course Introduction
Computer Networks is a comprehensive course designed to introduce students to fundamental concepts, architectures, and protocols that form the backbone of modern data communication systems. The course covers essential topics such as network models (OSI and TCP/IP), data transmission methods, network hardware, IP addressing, routing algorithms, switching, wireless and wired networking technologies, and network security measures. Through theoretical lessons and practical exercises, students gain hands-on experience in configuring networks, analyzing traffic, and troubleshooting connectivity issues. By the end of the course, learners will have a solid understanding of how networks operate, communicate, and support critical functions in contemporary digital environments.
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Business Data Communications Infrastructure Networking and Security 7th Edition by William Stallings
Chapter 1: Introduction
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Q1) __________ 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.
Answer: NIST (National Institute of Standards and Technology)
Q2) The four forms of information used by modern information systems are voice,data,image,and video.
A)True
B)False
Answer: True
Q3) __________ 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
Answer: C
Q4) Two types of transmission media recently gaining in popularity in business communications are __________ connections and fiber optic cables.
Answer: wireless
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Chapter 2: Business Information
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Q1) Common examples of data include text and numerical information.
A)True
B)False
Answer: True
Q2) The _________ service supports the communication of individual pictures,charts,or drawings.
Answer: image
Q3) 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
Answer: C
Q4) Some of the International Reference Alphabet text code patterns represent invisible,nonprintable characters called __________.
Answer: control characters
Q5) _________ is a 16-bit code that is backward compatible with IRA / ASCII. Answer: Unicode
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Chapter 3: Distributed Data Processing
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Q1) An _________ provides users of client devices with applications associated with the Internet but isolated within the organization.
Answer: intranet
Q2) More challenging failure diagnosis,more dependence on communications technology,incompatibility among equipment,and incompatibility among data are potential drawbacks of __________ data processing.
Answer: distributed
Q3) Extranets use different protocols and applications than are used in Intranets.
A)True
B)False
Answer: False
Q4) Centralized data processing typically involves terminals connected to large computers in a central data processing facility.
A)True
B)False
Answer: True
Q5) ________ is the creation of a virtual,rather than actual,version of something. Answer: Virtualization
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Chapter 4: Data Transmission
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Q1) 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.
Q2) 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
Q3) _________ is the unwanted coupling between signal paths.
A)Thermal noise
B)Intermodulation noise
C)Crosstalk
D)Impulse noise
Q4) In the telephone system,conversions are reproduced using the range from 3003400 Hz in order to limit the required capacity of transmission lines.
A)True
B)False
Q5) The _________ of a signal is the range of frequencies that it contains.
Q6) The width of the range of frequencies that comprise the signal is the ________.
Page 6
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Chapter 5: Data Communication Fundamentals
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Q1) In _________ the phase of the carrier signal is shifted to encode data.
A)PSK
B)FSK
C)ASK
D)BFSK
Q2) The mapping from binary digits to signal elements is the ________ scheme.
Q3) 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
Q4) Parity checking for error detection is most reliable for checking communications using high data rates.
A)True
B)False
Q5) Analog signals are:
A)continuous
B)discrete
C)discontinuous
D)all of the above
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Chapter 6: Data Link Control and Multiplexing
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Q1) It is common for a printer to be equipped with a higher data rate capability than its printing capability.
A)True
B)False
Q2) 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
Q3) 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
Q4) Data link control protocols are only used in private WANs.
A)True
B)False
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Chapter 7: The Internet
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Q1) The National Science Foundation was responsible for many of the policy decisions that led to the modern Internet.
A)True
B)False
Q2) If you receive an IP address automatically,the address of the DNS server can be provided at the same time.
A)True
B)False
Q3) _________ are programs that extract information from name servers in response to client requests.
A)Name servers
B)DNS
C)Resolvers
D)IP datagram
Q4) The __________ is a communications protocol for use in TCP / IP networks for fetching the files from the appropriate servers as specified by the hyperlinks.
Q5) The Internet is able to support communications using the ________ suite or its subsequent extensions / follow-ons,and / or other IP-compatible protocols.
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Chapter 8: Tcp / Ip
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Q1) Two protocol architectures have served as the basis for the development of interoperable protocol standards: the OSI reference model and the ________.
Q2) There are many protocols and technologies to select from when building an entire communication system.
A)True
B)False
Q3) WLAN standards have been designed to replace Ethernet.
A)True
B)False
Q4) For most applications running as part of the TCP / IP architecture,the transport layer protocol is _________.
Q5) Which of the following is a commonly used set of standards for computer communications?
A)SLA
B)ISO
C)POP
D)TCP / IP
Q6) An error detection code is also referred to as a frame check sequence or a
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Chapter 9: Client Server, intranet, and Cloud Computing
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Q1) Database applications are among the most common client-server implementations.
A)True
B)False
Q2) The traditional client / server architecture involves two levels,or tiers: a client tier and a _________ tier.
Q3) A server-based processing model uses a "fat server" rather than a "fat client".
A)True
B)False
Q4) A(n)_________ uses Internet technology and applications to provide in-house support for distributed applications.
Q5) A computer that houses information for manipulation by networked clients is a __________.
A)server
B)minicomputer
C)PaaS
D)broker
Q6) Support tools for intranets are easily available.
A)True
B)False
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Chapter 10: Internet-Based Applications
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Q1) Image-based applications include facsimile,computer-aided design (CAD),publishing,and medical imaging.
A)True
B)False
Q2) HTTP uses a request / response style of communication.
A)True
B)False
Q3) A number of protocols are instrumental in supporting multimedia traffic.
A)True
B)False
Q4) A(n)_________ is an Internet e-mail provider.
A)POP
B)ADMD
C)DNS
D)IEP
Q5) The rapid growth in the use of the Web is due to the standardization of all the elements that support Web applications.
A)True
B)False
Q6) A _______ is a network data object or service that can be identified by a URL.
Page 12
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Chapter 11: Internet Operation
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Q1) 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
Q2) IP addresses are usually written in what is called ___________ notation ,with a decimal number representing each of the octets of the 32-bit address.
Q3) Subnets are used where the number of networks exceeds the number of hosts within a specific company or organization.
A)True
B)False
Q4) 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.
A)True
B)False
Q5) IPv6 allows three types of addresses: unicast,anycast,and _________.
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Chapter 12: Lan Architecture and Infrastructure
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Q1) Higher-level data,such as an IP datagram,are passed down to LLC,which appends control information as a header,creating an LLC ___________.
Q2) 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.
A)True
B)False
Q3) A Storage Area Network (SAN)is a network specifically designed to allow specific servers the ability to share local storage devices with each other.
A)True
B)False
Q4) 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 ___________.
Q5) Traditionally,twisted pair has been the workhorse for communications of all sorts.
A)True
B)False
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Chapter 13: Ethernet, switches, and Virtual Lans
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Q1) Network topology refers to the way individual end stations access the network prior to transmission of user data.
A)True
B)False
Q2) The _________ specifies the station that sent the frame.
A)MAC client data
B)SFD
C)SA
D)FCS
Q3) In the MAC frame,the start of frame delimited (SFD)provides the receiver with the starting point of meaningful data in the frame.
A)True
B)False
Q4) 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.
Q5) Segmenting a larger network into ___________ domains can help to prevent a fault in one network segment from affecting the entire network.
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Chapter 14: Wireless Lans
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Q1) 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
Q2) _________ 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
Q3) WLANs use one of three transmission techniques: spread spectrum, narrowband microwave,and __________.
Q4) Information that is delivered as a unit between MAC users.
A)MPDU
B)ESS
C)MSDU
D)DS
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Chapter 15: Wan Technology and Protocol
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Q1) Presence information is associated with every presentity in the system and is maintained by the presence service.
A)True
B)False
Q2) ________ are the switching centers in the network.
A)Subscribers
B)Subscriber line
C)Exchanges
D)Trunks
Q3) Communication via circuit switching involves three phases: circuit establishment,________,and circuit disconnect.
Q4) In most networks,not every sender / receiver pair can be connected.
A)True
B)False
Q5) The choice between circuit and packet switching depends on a host of considerations,including cost,performance,reliability, and flexibility.
A)True
B)False
Q6) ________ signals identify a subscriber.
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Chapter 16: Wan Services
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Q1) 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.
A)True
B)False
Q2) ___________ notifies the user that congestion avoidance procedures should be initiated where applicable for traffic in the same direction as the received frame.
Q3) ATM provides a flexible set of traffic control mechanisms that are based on the type of user data.
A)True
B)False
Q4) In ATM,the basic transmission unit is the ________.
A)frame
B)cell
C)packet
D)segment
Q5) Most WAE implementations use __________to interconnect network endpoints.
Q6) A _________ is a bundle of virtual channels that have the same endpoints.
Q7) Logical connections in ATM are referred to as __________.
Q8) WAE uses _________ connectivity to deliver high-speed WAN service.
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Chapter 17: Wireless Lans
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Q1) ___________ 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.
Q2) 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.
Q3) The base station selected for communication with a mobile unit is always the one closest to the current location of the unit.
A)True
B)False
Q4) A __________ is a mobile device that mobile workers can use as a personal information manager.
Q5) 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.
A)True
B)False
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Chapter 18: Computer and Network Security Threats
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Q1) _________ are in the nature of eavesdropping on,or monitoring of, transmissions.The goal of the attacker is to obtain information that is being transmitted.
Q2) __________ capture keystrokes on a compromised system.
A)Worms
B)Zombies
C)Keyloggers
D)All of the above
Q3) A stealth virus is explicitly designed to hide itself from detection by antivirus software.
A)True
B)False
Q4) A _________ propagates itself and activates itself,whereas a bot is controlled from some central facility,at least initially.
Q5) 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
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Chapter 19: Computer and Network Security Techniques
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Q1) IP-level security encompasses three functional areas: authentication, confidentiality,and _________.
Q2) Ports are logical entities defined within the authenticator and refer to physical network connections.
A)True
B)False
Q3) The ________________ facility enables communicating nodes to encrypt messages to prevent eavesdropping by third parties.
Q4) Most organizations agree that __________ become their worst security problem. A)their own users
B)viruses
C)intrusions
D)managers
Q5) 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
Q6) An IDS comprises three logical components: sensors,user interface,and _______.
Page 21
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