Data Communications Exam Solutions
Course Introduction
Data Communications explores the foundational principles and technologies that enable the transfer of digital information between devices and across networks. The course covers essential topics such as signal transmission, data encoding, protocols, error detection and correction, multiplexing, and network topologies. Students will learn about both wired and wireless communication methods, examine the structure and function of the OSI and TCP/IP models, and investigate the performance and security issues related to modern data networks. Through theoretical discussion and practical exercises, learners acquire the knowledge necessary to understand, evaluate, and troubleshoot data communications systems in both local and wide-area networking environments.
Recommended Textbook
CWNA Guide to Wireless LANs 3rd Edition by Mark Ciampa
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Chapter 1: The World of Wireless
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Sample Questions
Q1) What type of device is used in the medical field to diagnose digestive problems without surgery?
A) video pill
B) RFID
C) wireless LAN
D) barcoded medications
Answer: A
Q2) List four advantages of using wireless technology.
Answer: The advantages include mobility, increased access, improved and extended connectivity, and easier and less expensive deployment.
Q3) SOHO businesses are not likely to benefit from wireless data communications because of the substantial costs of setting up a wireless network.
A)True
B)False
Answer: False
Q4) Name three sectors of the exonomy that use wireless technology extensively.
Answer: Sectors that use wireless technology extensively include education, business, industry, travel, public safety, and health care.
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Chapter 2: Wireless Local Area Networks
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Q1) Which is NOT a limitation of infrared wireless systems?
A) lack of mobility
B) doesn't work well indoors
C) slow transmission speed
D) limited range
Answer: B
Q2) Remote wireless ____________________ can connect sites such as satellite offices,remote campus settings,or temporary office locations when the sites are separated by obstacles such as bodies of water,freeways,or railroads that make using a wired connection impractical or very expensive.
Answer: bridges
Q3) The IEEE 802.11g standard requires the strongest level of wireless security.
A)True
B)False
Answer: False
Q4) List the four modes in which a wireless bridge can function.
Answer: Root mode
Nonroot mode
Repeater mode
Access point mode
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Chapter 3: Radio Frequency Fundamentals
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Sample Questions
Q1) List the four properties that are used to describe an electromagnetic wave. Answer: wavelength frequency amplitude phase
Q2) The way in which RG signals travel is referred to as wave ____________.
Answer: propagation
Q3) The term ____ describes the rate of electrical flow.
A) voltage
B) current
C) resistance
D) electrical power
Answer: B
Q4) Electromagnetic waves travel through space at the speed of light.
A)True
B)False
Answer: True
Q5) ____________________ shift keying is a binary modulation similar to phase modulation.
Answer: Phase
Page 5
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Chapter 4: Antennas
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Sample Questions
Q1) An RF signal ____________ has one input and two or more outputs,which divides the power of the input signal to multiple outputs.
Q2) Something that has absolute uniformity in all its characteristics in all directions is called _____________.
Q3) Which type of antenna is used for long-distance point-to-point wireless links?
A) omnidirectional
B) unidirectional
C) semidirectional
D) highly-directional
Q4) What term is used to describe an electrical entity that hinders the flow of current and is often a result of a mismatch between two devices?
A) fade margin
B) sensitivity
C) negative gain
D) impedance
Q5) If an antenna has a ____________ gain in one direction,it must have a decrease in the other directions.
Q6) What are highly-directional antennas typically used for?
Q7) What is the most common type of antenna for a WLAN?
Page 6
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Chapter 5: Physical Layer Standards
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Sample Questions
Q1) The 802.11a standard enables faster data rates than 802.11b due to which of the following?
A) lower frequencies and decreased power
B) lower frequencies and increased power
C) higher frequencies and increased power
D) decreased power but higher frequencies
Q2) Which of the following is true about the frequencies 802.11b uses?
A) 28 total,22 used in Japan and China
B) 14 total,only 11 used in the U.S.
C) 22 total,only 14 used in Europe
D) 52 total,48 usable
Q3) What are the two sublayers that the OSI Physical layer is broken into with the IEEE model?
Q4) How does OFDM work?
A) signals are broken up and the parts are sent in parallel
B) the same signal is sent on multiple channels
C) one signal is sent twice on the same channel
D) a signal is sent over a wired network at the same time as the wireless network
Q5) What is a disadvantage of narrowband transmissions?
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Chapter 6: Medium Access Control Layer Standards
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Sample Questions
Q1) Which is true of passive scanning?
A) a station listens for a beacon frame with an SSID for a set period of time
B) a station sends out a directed probe
C) a station sends out a broadcast probe
D) APs with a matching SSID will reply with a probe response
Q2) Increasing the beacon interval will normally increase wireless network traffic as well.
A)True
B)False
Q3) List the four different access category classes defined by EDCA.
Q4) Which of the following are access category classes into which EDCA divides transmissions? (Choose all that apply.)
A)background
B)video
C)binary
D)best effort
Q5) A BSS is served by one or more APs.
A)True
B)False
Q6) Describe three of the interframe spaces (IFS)defined in the 802.11 standard.
Page 8
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Chapter 7: WLAN Management and Architectures
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Sample Questions
Q1) List four of the typical feature sets found in autonomous APs.
Q2) Which are features of a wireless network management system? (Choose all that apply.)
A) wireless routing
B) device monitoring
C) intelligent scheduling
D) channel stacking
Q3) Describe how single channel architectures provide smoother handoffs compared to MCAs.
Q4) What happens when an AP sends a DTIM?
A) only stations in continuously aware mode receive it
B) stations in power save mode ignore it
C) only stations in sleep mode receive it
D) all stations change to active mode
Q5) Define the WLAN profile feature provided by WLCs.
Q6) Which network area are you likely to find LAN routers and Layer 3 switches?
A) control layer
B) backbone layer
C) access layer
D) workgroup layer
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Chapter 8: Conducting a Site Survey
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Sample Questions
Q1) What is a spectrum analyzer?
Q2) List the three USB spectrum analyzer views.
Q3) Which site survey analyzer setting sets the number of times a transmission will be repeated if an acknowledgment (ACK)frame is not returned by the destination device?
A) continuous link test
B) percent success threshold
C) delay between packets
D) data retries
Q4) Describe a predictive site survey.
Q5) Which of the following shows energy as a function of frequency at the time the signal is being transmitted?
A) waterfall view
B) waveform view
C) realtime view
D) traditional view
Q6) Explain why MIMO's benefits may not be an advantage with a VoWiFi handset.
Q7) The final step in the site survey process is to create the report.
A)True
B)False
10
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Chapter 9: Wireless LAN Security Vulnerabilities
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Sample Questions
Q1) Describe one weakness of MAC address filtering.
Q2) Attacks that use many computers to attack a single network are called centralized attacks.
A)True
B)False
Q3) A ____ attack on WEP involves identifying two packets derived from the same IV.
A) capture
B) keystream
C) weak key
D) pseudo-random number
Q4) WEP guards one of the CIA characteristics,namely what?
A) integrity
B) availability
C) confidentiality
D) access control
Q5) Describe war driving.
Q6) Describe the five steps in the process of WEP encryption.
Q7) The three protections that must be extended over information can be described by the acronym ________.
Q8) Describe open system authentication.
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Chapter 10: Implementing Wireless LAN Security
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Sample Questions
Q1) What is EAP?
Q2) What does WPA use for authentication?
A) Kerberos
B) open system authentication
C) preshared key
D) certificates
Q3) Kerberos became the heart of the WPA security method.
A)True
B)False
Q4) Which WEP weaknesses were identified by universities and other organizations?
(Choose all that apply)
A)The RC4 PRNG is not properly implemented.
B)WEP didn't always encrypt the data.
C)Initialization vector keys are reused.
D)WEP does not prevent man-in-the-middle attacks.
Q5) Dictionary attacks are used to attack what aspect of WEP2?
A) encryption
B) initialization vector problems
C) pseudo-random number generator issues
D) authentication
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Chapter 11: Managing a Wireless LAN
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Sample Questions
Q1) Which best describes kinesthetic learners?
A) learn by watching presentations
B) work well with hands-on environments
C) learn best through lectures
D) tend to like taking notes
Q2) What is a difference between RMON and SNMP?
A) RMON uses MIBs
B) SNMP gathers network statistics
C) RMON uses dedicated devices
D) RMON is found on enterprise-level APs
Q3) List and describe three RF site tuning settings.
Q4) The point of RF site tuning is to locate where APs should be mounted.
A)True
B)False
Q5) Which of the following are RF site tuning settings? (Choose all that apply.)
A)adjust transmission frequency
B)adjust radio power levels on APs
C)adjust channel settings
D)validate coverage area
Q6) Provide a thorough definition of security policy.
Page 13
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Chapter 12: Wireless Network Troubleshooting and Optimization
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Sample Questions
Q1) If a wireless device is not connecting with the AP,what are the first two things you should check? (Choose two.)
A) wireless device and AP are configured for the same subnet
B) matching SSID
C) excessive collisions
D) security settings
Q2) The noise floor indicates the strongest signal that can be received.
A)True
B)False
Q3) One way to reduce ISI for outdoor settings is to use which type of antenna?
A) omnidirectional
B) unidirectional
C) highly-directional
D) multidirectional
Q4) In a wireless environment,a station might be in the range of an AP but not in the range of all other stations.
A)True
B)False
Page 14
Q5) One of the main sources of WLAN problems is ____________ interference.
Q6) Describe the noise floor.
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Page 15
Chapter 13: Other Wireless Networks
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Sample Questions
Q1) One of the drawbacks of the proposed 802.11ac standard is an expected lower battery life for wireless devices using this standard.
A)True
B)False
Q2) List the advantages of broadband radio service (BRS).
Q3) What is a Bluetooth piconet?
Q4) Active RFID tags do not require their own power source.
A)True
B)False
Q5) Which of the following are advantages of VLC? (Choose all that apply.)
A) signals are spread wide for large coverage
B) visible light is not harmful to humans
C) EMI does not impact VLC
D) strict regulations govern its use
Q6) What technology does LTE use to achieve higher data rates?
A) OFDM
B) CSMA/CD
C) FHSS
D) WiMax
Q7) Describe visible light communications (VLC).
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