CWNA Chapter 12

40 Questions | Attempts: 215
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  • 1/40 Questions

    What usually determines the rules of when a client station decides to roam?

    • Receive signal strength indicator
    • Airtime Fairness
    • CSMA/CA
    • Radio Resource Measurement
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  • 2. 

    What causes client station radios to shift down to lower bandwidth as it moves away from an access point?

    • Roaming

    • Dynamic Rate Switching

    • Jitter

    • Hidden Node

    Correct Answer
    A. Dynamic Rate Switching
  • 3. 

    What problems do lightning present to WLAN?

    • Antenna shifting

    • Damage to equipment

    • Damage to cables

    • Refraction of signal

    Correct Answer
    A. Damage to equipment
  • 4. 

    What type of interference is caused by destructive multipath?

    • Intersymbol

    • All-band

    • Wideband

    • Narrowband

    Correct Answer
    A. Intersymbol
  • 5. 

    What is the time it takes to deliver VoIP packet from the source device to the destination device?

    • Jitter

    • Latency

    • Throughput

    • Overhead

    Correct Answer
    A. Latency
  • 6. 

    Why does a building with concrete walls need more access points than a building with dry wall?

    • Concrete is denser than drywall and attenuates the signal faster

    • Concrete deflects the signal back

    • Signals cannot pass through concrete

    • Drywall never affects a signal

    Correct Answer
    A. Concrete is denser than drywall and attenuates the signal faster
  • 7. 

    What part of WLAN makes the decision on whether or not to roam between access points?

    • Access Point

    • Client Stations

    • ESS

    • Administrator

    Correct Answer
    A. Client Stations
  • 8. 

    What is the most traditional channel pattern in the United States and Canada?

    • 3 channel

    • 4 channel

    • 5 channel

    • 2 channel

    Correct Answer
    A. 3 channel
  • 9. 

    What mistake is often made when deploying access points?

    • Transmitting at full power

    • Mismatched power settings

    • Hidden node

    • Improper Channel reuse

    Correct Answer
    A. Transmitting at full power
  • 10. 

    What can cause hidden node problem?

    • Physical obstructions and poor WLAN design

    • Other signals interferring

    • Mismatched power settings

    • Low SNR

    Correct Answer
    A. Physical obstructions and poor WLAN design
  • 11. 

    Which of these can cause a roaming problem?

    • Too little or too much duplicate cell coverage

    • Hidden node

    • Free space path loss

    • CSMA/CA

    Correct Answer
    A. Too little or too much duplicate cell coverage
  • 12. 

    Which of these weather conditions is a concern when deploying a long-distance point-to-point bridge link?

    • Changes in air temperature

    • Wind

    • Rain

    • Fog

    Correct Answer
    A. Changes in air temperature
  • 13. 

    What is an alternative WLAN channel design that has multiple access points all on the same channel and with the same BSSID?

    • Multiple Channel Architecture

    • Single-Channel Architecture

    • Four channel Plan

    • Three Channel Plan

    Correct Answer
    A. Single-Channel Architecture
  • 14. 

    Which of these would NOT affect range in an 802.11 WLAN?

    • Transmission power

    • CSMA/CA

    • Encryption

    • Antenna gain

    Correct Answer
    A. CSMA/CA
  • 15. 

    What can Oversized Coverage Cells cause?

    • Hidden node problem

    • RF interference

    • Mismatched Power Settings

    • Low SNR

    Correct Answer
    A. Hidden node problem
  • 16. 

    What can cause Layer 2 retransmissions and is often overlooked?

    • Mismatched Power Settings

    • Low SNR

    • Adjacent Channel Interference

    • Wideband Interference

    Correct Answer
    A. Mismatched Power Settings
  • 17. 

    What can Air Stratification cause?

    • Damage to cables

    • Damage to equipment

    • Refraction of signal

    • Movement of antenna direction

    Correct Answer
    A. Refraction of signal
  • 18. 

    What is the method by which client stations move between RF coverage cells in a seamless manner?

    • Dynamic Rate Switching

    • Jitter

    • Roaming

    • Co-Channel Interference

    Correct Answer
    A. Roaming
  • 19. 

    What interference occurs because all the Access Points are on the same channel called?

    • Wide Band

    • Co-Channel

    • All-Band

    • Adjacent Channel

    Correct Answer
    A. Co-Channel
  • 20. 

    What is NOT a cause of layer 2 retransmissions?

    • Co-Channel Interference

    • Low SNR

    • RF Interference

    • Multipath

    Correct Answer
    A. Co-Channel Interference
  • 21. 

    Different regions such as Europe use a different form of channel reuse pattern, what is it?

    • 5 channel

    • 4 channel

    • 2 channel

    • 3 channel

    Correct Answer
    A. 4 channel
  • 22. 

    What should be done to prevent damage to equipment from lightning?

    • Install drip loops and coax seals

    • Install a grid antenna

    • Install a radome

    • Install lightning arrestors or copper/fiber transceivers

    Correct Answer
    A. Install lightning arrestors or copper/fiber transceivers
  • 23. 

    How should wind interference be dealt with?

    • Install drip loops

    • Get a radome

    • Install a grid antenna

    • Coax seals

    Correct Answer
    A. Install a grid antenna
  • 24. 

    Channel Reuse Design is used to avoid or prevent what kinds of interference?

    • Wide Band and All-Band

    • Narrowband and Wide band

    • Adjacent Channel and Co-Channel

    • Adjacent Channel and All-band

    Correct Answer
    A. Adjacent Channel and Co-Channel
  • 25. 

    What is a common mistake made by many businesses when first deploying a WLAN?

    • Improper design

    • Misconfiguration

    • Configuring multiple access points on the same channel

    • Using the wrong protocol

    Correct Answer
    A. Configuring multiple access points on the same channel
  • 26. 

    Which of these would NOT effect range in an 802.11 WLAN?

    • Wavelength

    • Free Space Path Loss

    • Trees

    • Brick Walls

    Correct Answer
    A. Trees
  • 27. 

    What kind of interference occupies a smaller and finite frequency space?

    • RF

    • Wideband

    • All-Band

    • Narrowband

    Correct Answer
    A. Narrowband
  • 28. 

    What term do Wi-Fi vendors use to explain degrading performance due to overlapping frequency space?

    • Wideband

    • Narrowband

    • All-band

    • Adjacent Channel

    Correct Answer
    A. Adjacent Channel
  • 29. 

    What problem occurs when one client station's transmissions are heard by the access point but not by any of the other client stations in the BSS?

    • Low SNR

    • Near/Far

    • Hidden Node

    • Latency

    Correct Answer
    A. Hidden Node
  • 30. 

    What is the maximum number of overlapping channels that can be deployed in the 2.4GHz ISM band?

    • 12

    • 11

    • 4

    • 3

    Correct Answer
    A. 3
  • 31. 

    Air Stratification is another word for what that causes a change in signal?

    • Change in wind direction

    • Change in air pressure

    • Change in air temperature at high altitudes

    • Change in wind speed

    Correct Answer
    A. Change in air temperature at high altitudes
  • 32. 

    Which of these is NOT a way to fix a hidden node problem?

    • Remove any obstacles

    • Add another access point

    • Use RTS/CTS to diagnose

    • Redesign the entire WLAN

    Correct Answer
    A. Redesign the entire WLAN
  • 33. 

    UV rays or exposure to the sun can damage what from too much exposure on a roof?

    • Antennas

    • Devices

    • Connectors

    • Cables

    Correct Answer
    A. Cables
  • 34. 

    Which of these is NOT one of the negative effects of layer 2 retransmissions?

    • Decreased range

    • Excessive MAC sublayer overhead

    • Jitter

    • Increased latency

    Correct Answer
    A. Jitter
  • 35. 

    Which of the following do NOT cause roaming problems?

    • Too little cell coverage overlap

    • Too much coverage cell overlap

    • Free space path loss

    • Hidden node

    Correct Answer
    A. Free space path loss
  • 36. 

    In the 5GHz frequency bands there are 24 channels that may be used in a channel reuse pattern, but only how many are available for reuse in the United States?

    • 23

    • 15

    • 21

    • 20

    Correct Answer
    A. 21
  • 37. 

    What form of interference is typically associated with FHSS communications?

    • Wideband

    • Narrow band

    • RF

    • All-band

    Correct Answer
    A. All-band
  • 38. 

    What type of interference has the capability to disrupt the communications of an entire frequency band?

    • All-band interference

    • Narrowband interference

    • Wideband interference

    • RF interference

    Correct Answer
    A. Wideband interference
  • 39. 

    As defined by the 802.11k amendment, what is used to enhance roaming performance?

    • Receive Signal Strength Indicator

    • Airtime Fairness

    • Radio Resource Measurement

    • Duplicate Coverage

    Correct Answer
    A. Radio Resource Measurement
  • 40. 

    What is each layer of multiple APs on a single channel using the same BSSID known as?

    • Channel Stacking

    • Zero Hand-off

    • Channel Blanket

    • Single Channel Architecture

    Correct Answer
    A. Channel Blanket

Quiz Review Timeline (Updated): Apr 7, 2013 +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Apr 07, 2013
    Quiz Edited by
    ProProfs Editorial Team
  • Apr 07, 2013
    Quiz Created by
    KillaCadillack
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