Computer Networks
Study Guide Questions
Course Introduction
This course provides a comprehensive introduction to the fundamental concepts and technologies that enable modern computer networks. Topics include network architectures, protocols, data transmission, switching and routing, the OSI and TCP/IP models, network security, wireless and wired communication, and the principles of network design and administration. Through theoretical study and practical exercises, students will gain an understanding of how data is transmitted across complex networks, the challenges involved in ensuring efficient and secure communication, and the foundational technologies upon which the internet and local area networks are built.
Recommended Textbook
CWNA Guide to Wireless LANs Networking 2nd Edition by Mark Ciampa
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12 Chapters
504 Verified Questions
504 Flashcards
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Page 2
Chapter 1: Its a Wireless World
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41 Verified Questions
41 Flashcards
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Sample Questions
Q1) What is the maximum transmission distance for FSO?
A) 4 miles
B) 6.4 miles
C) 10 miles
D) 100 miles
Answer: A
Q2) A cold site is a fully functional office space generally run by a commercial disaster recovery service that allows a business to continue computer and network operations to maintain business continuity.
A)True
B)False
Answer: False
Q3) What is the range of transmission for a WPAN?
A) 3 feet
B) 10 feet
C) 14 feet
D) 22 feet
Answer: B
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Chapter 2: Wireless LAN Devices and Standards
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Sample Questions
Q1) ____________________ bands are in effect bands of the radio spectrum that are available nationwide to all users, without requiring a license.
Answer: Unregulated
Q2) A remote wireless bridge can function in one of four different modes. Describe each mode.
Answer: If a remote wireless bridge is in access point mode it functions as a standard AP only and does not communicate with other remote wireless bridges. In root mode the bridge, called the root bridge, can only communicate with other bridges that are not in root mode. A root bridge cannot communicate with another root bridge or any wireless clients.
If a remote wireless bridge is set to non-root mode, it can only transmit to another bridge in root mode. Some bridge manufacturers enable a remote wireless bridge also to be configured as an access point. This allows the bridge to communicate with a remote wireless root bridge while simultaneously sending and receiving signals with the wireless clients.
In order to extend the distance between LAN segments, another remote wireless bridge may be positioned between two other bridges. This bridge is then in repeater mode.
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Page 4
Chapter 3: How Wireless Works
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Sample Questions
Q1) Why is it important to understand how wireless technology works?
Answer: Knowing how wireless works can become an important tool in troubleshooting a WLAN that is not functioning correctly. Although access points (APs) are no longer expensive items to purchase, often the problem with a wireless network does not lie with the equipment but instead with the signal that is being transmitted and obstructions to that signal. Knowing how a wireless signal is transmitted can help in isolating and correcting problems.
Q2) ____ polarization is typically used in wireless LANs with the dual antennas of access points pointing upward.
A) Vertical
B) Horizontal
C) Circular
D) Dual Answer: A
Q3) ____ modulation changes the number of waves representing one cycle.
A) Amplitude
B) Phase shift
C) Frequency
D) Phase Answer: C
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Chapter 4: IEEE 80211 Physical Layer Standards
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Sample Questions
Q1) Although 54 Mbps is the "official" top speed of 802.11a, the IEEE specification also allows for higher speeds. These higher speeds are known as ____________________ mode or 2X mode.
Q2) The 802.11g standard outlines two mandatory modes along with one optional mode. Describe each mode.
Q3) DSSS uses a bit pattern called a ____ code.
A) hopping
B) setting
C) dwelling
D) chipping
Q4) IEEE has divided the ____ layer into two sublayers: Logical Link Control (LLC) and Media Access Control (MAC).
A) Physical
B) Data Link
C) Transport
D) Session
Q5) There are two disadvantages to using U-NII. What are they?
Q6) What is the Open Systems Interconnection (OSI) reference model?
Q7) Describe the FCC restrictions on FHSS.
Q8) What are disadvantages of the 802.11g standard?
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Chapter 5: IEEE 80211 Media Access Control and Network
Layer Standards
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41 Verified Questions
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Sample Questions
Q1) What is a management frame? What are the fields in this type of frame?
Q2) Describe Mobile IP.
Q3) What is the difference between passive and active scanning?
A) which device initiates the discovery
B) the speed at which discovery is made
C) the number of devices that can be supported
D) the security of the network
Q4) At regular intervals the AP in an infrastructure network or wireless device in an ad hoc network sends a ____ frame both to announce its presence and to provide the necessary information for other devices to join the network.
A) master
B) beacon
C) data
D) control
Q5) CSMA/CA eliminates the possibility of collisions.
A)True
B)False
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Q6) ____________________ involves dividing the data to be transmitted from one large frame into several smaller ones.
Chapter 6: Planning and Deploying a Wireless LAN
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Sample Questions
Q1) Describe the importance and benefits of training users while deploying a wireless network.
Q2) Wireless access to network resources can improve the quality and productivity of meetings.
A)True
B)False
Q3) Channel ____________________ calls for adjacent access points to use nonoverlapping channels so that the access point using one channel will not interfere with its neighbor.
Q4) Two adjacent access points that use the same ____ can cause interference and lost frames.
A) station
B) channel
C) hotspot
D) ESS
Q5) List and describe two soft benefits of WLANs.
Q6) What are thin access points? Describe some of the benefits of using them.
Q7) What are the considerations for arranging access points in an ad hoc configuration?
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Q8) ____________________ is a standard measure of the profitability of a project.
Chapter 7: Conducting a Site Survey
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Sample Questions
Q1) The coverage ____________________ is the area in which the signal can be received from the AP.
Q2) You would use ____ in documenting a site survey.
A) a digital camera
B) blueprints
C) plain paper
D) All of the above
Q3) The transmission ____________________ is the farthest distance at which the signal can be received by the wireless device.
Q4) Why is it important to document existing wired and wireless networks?
A) to examine possible sources of interference
B) to ensure that the new or expanded wireless LAN will "dovetail" into what is already in place
C) to avoid providing overlapping network coverage
D) to better understand the basic networking needs of the organization
Q5) What should be included in a site survey report?
Q6) How is RF information actually (physically) collected?
Q7) What are some of the design goals of a site survey?
Q8) What is a site survey analyzer?
Q9) What special considerations exist for outdoor site surveys? Page 9
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Page 10
Chapter 8: Wireless LAN Security and Vulnerabilities
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Sample Questions
Q1) A wireless DoS attack may involve an attacker sending a series of ____ frames to a wireless device.
A) disassociation
B) drop
C) misaddressed
D) incomplete
Q2) In a 64-bit packet sent using WEP, how many bits are actually encrypted?
A) 10
B) 24
C) 40
D) 64
Q3) Briefly describe cryptography and discuss its history.
Q4) Which characteristic of information is guarded by access control?
A) availability
B) integrity
C) confidentiality
D) robustness
Q5) The term _________________________ is frequently used to describe the tasks of guarding information that is in a digital format.
Q6) Describe one trend that is making security increasingly difficult.
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Chapter 9: Implementing Wireless Lan Security
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Sample Questions
Q1) The personal security model is intended for settings in which a(n) ____ is unavailable.
A) wired network
B) authentication server
C) AP
D) intermediate security model
Q2) WEP2 attempted to overcome the limitations of WEP by adding two new security enhancements.
A)True
B)False
Q3) A network supporting the 802.1x standard consists of three elements. Identify and describe each one.
Q4) ____ is considered to be the "heart and soul" of WPA security.
A) PSK
B) IV
C) MIC
D) TKIP
Q5) ____________________ was developed by the Massachusetts Institute of Technology (MIT) and used to verify the identity of network users.
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Chapter 10: Managing a Wireless LAN
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Sample Questions
Q1) The current version of SNMP (____) addresses security and remote configuration.
A) v1
B) v2
C) v3
D) v4
Q2) What is the last step in RF site tuning?
A) adjust channel settings
B) documenting changes
C) modify throughput
D) validate coverage area
Q3) What information is required for a link budget?
A) power of the transmitter
B) path length
C) frequency of the link
D) All of the above
Q4) Many enterprise-level access points provide utilities that offer three types of information. What are they?
Q5) List and describe three RF tuning settings.
Q6) In order to use SNMP, a software ____________________ is loaded onto each network device that will be managed using SNMP.
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Chapter 11: Network Settings and Wireless LAN
Troubleshooting
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Sample Questions
Q1) Describe the LED indicator lights that appear on an AP.
Q2) In Mobile IP, what information is advertised on the network?
A) whether an agent is a home agent, foreign agent, or both
B) care-of address
C) types of services provided
D) All of the above
Q3) What is a good first step in diagnosing system throughput issues?
A) monitor the speed of the access point
B) remove all devices from the system then add them back one at a time
C) determine if all devices are experiencing the problem or only a single device
D) identify the potential causes that may have the least impact on the system if they are changed
Q4) How would you solve a near/far transmission problem?
Q5) Enabling the ____________________ stops radio transmissions from the access point for the specified number of seconds if the AP detects no activity on the Ethernet line.
Q6) The ____________________ access point uses a subnet map to keep track of the home agent information for all visiting client devices.
Page 14
Q7) The primary port of the AP is almost always the ____________________ network port.
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Page 15
Chapter 12: Personal, Metropolitan, and Wide Area Wireless
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Sample Questions
Q1) A group of piconets in which connections exist between different piconets is called a(n) ____________________.
Q2) Describe a geosynchronous earth orbit.
Q3) Free space optics (FSO) transmissions are sent by low-powered ____ beams through the open air.
A) infrared
B) fiber optic
C) RF
D) wireless
Q4) If multiple piconets cover the same area, a Bluetooth device can be a member in two or more overlaying piconets.
A)True
B)False
Q5) Describe wireless personal area networks.
Q6) There are several advantages of free space optics (FSO) compared to fiber optic and RF systems. List and describe them.
Q7) Describe the way cellular telephone networks work.
Q8) In a cellular telephone network all of the transmitters and cell phones operate at a(n) ____________________ power level. Page 16
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Page 17