CWNA Chapter 12
- 1.
What is the time it takes to deliver VoIP packet from the source device to the destination device?
- A.
Jitter
- B.
Latency
- C.
Throughput
- D.
Overhead
Correct Answer
B. Latency -
- 2.
What type of interference has the capability to disrupt the communications of an entire frequency band?
- A.
All-band interference
- B.
Narrowband interference
- C.
Wideband interference
- D.
RF interference
Correct Answer
C. Wideband interference -
- 3.
What form of interference is typically associated with FHSS communications?
- A.
Wideband
- B.
Narrow band
- C.
RF
- D.
All-band
Correct Answer
D. All-band -
- 4.
What term do Wi-Fi vendors use to explain degrading performance due to overlapping frequency space?
- A.
Wideband
- B.
Narrowband
- C.
All-band
- D.
Adjacent Channel
Correct Answer
D. Adjacent Channel -
- 5.
What can cause Layer 2 retransmissions and is often overlooked?
- A.
Mismatched Power Settings
- B.
Low SNR
- C.
Adjacent Channel Interference
- D.
Wideband Interference
Correct Answer
A. Mismatched Power Settings -
- 6.
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?
- A.
Low SNR
- B.
Near/Far
- C.
Hidden Node
- D.
Latency
Correct Answer
C. Hidden Node -
- 7.
What can cause hidden node problem?
- A.
Physical obstructions and poor WLAN design
- B.
Other signals interferring
- C.
Mismatched power settings
- D.
Low SNR
Correct Answer
A. Physical obstructions and poor WLAN design -
- 8.
Which of these is NOT a way to fix a hidden node problem?
- A.
Remove any obstacles
- B.
Add another access point
- C.
Use RTS/CTS to diagnose
- D.
Redesign the entire WLAN
Correct Answer
D. Redesign the entire WLAN -
- 9.
What causes client station radios to shift down to lower bandwidth as it moves away from an access point?
- A.
Roaming
- B.
Dynamic Rate Switching
- C.
Jitter
- D.
Hidden Node
Correct Answer
B. Dynamic Rate Switching -
- 10.
What is the method by which client stations move between RF coverage cells in a seamless manner?
- A.
Dynamic Rate Switching
- B.
Jitter
- C.
Roaming
- D.
Co-Channel Interference
Correct Answer
C. Roaming -
- 11.
What part of WLAN makes the decision on whether or not to roam between access points?
- A.
Access Point
- B.
Client Stations
- C.
ESS
- D.
Administrator
Correct Answer
B. Client Stations -
- 12.
Which of these can cause a roaming problem?
- A.
Too little or too much duplicate cell coverage
- B.
Hidden node
- C.
Free space path loss
- D.
CSMA/CA
Correct Answer
A. Too little or too much duplicate cell coverage -
- 13.
As defined by the 802.11k amendment, what is used to enhance roaming performance?
- A.
Receive Signal Strength Indicator
- B.
Airtime Fairness
- C.
Radio Resource Measurement
- D.
Duplicate Coverage
Correct Answer
C. Radio Resource Measurement -
- 14.
What usually determines the rules of when a client station decides to roam?
- A.
Receive signal strength indicator
- B.
Airtime Fairness
- C.
CSMA/CA
- D.
Radio Resource Measurement
Correct Answer
A. Receive signal strength indicator -
- 15.
What is a common mistake made by many businesses when first deploying a WLAN?
- A.
Improper design
- B.
Misconfiguration
- C.
Configuring multiple access points on the same channel
- D.
Using the wrong protocol
Correct Answer
C. Configuring multiple access points on the same channel -
- 16.
What interference occurs because all the Access Points are on the same channel called?
- A.
Wide Band
- B.
Co-Channel
- C.
All-Band
- D.
Adjacent Channel
Correct Answer
B. Co-Channel -
- 17.
Channel Reuse Design is used to avoid or prevent what kinds of interference?
- A.
Wide Band and All-Band
- B.
Narrowband and Wide band
- C.
Adjacent Channel and Co-Channel
- D.
Adjacent Channel and All-band
Correct Answer
C. Adjacent Channel and Co-Channel -
- 18.
Different regions such as Europe use a different form of channel reuse pattern, what is it?
- A.
5 channel
- B.
4 channel
- C.
2 channel
- D.
3 channel
Correct Answer
B. 4 channel -
- 19.
What is the most traditional channel pattern in the United States and Canada?
- A.
3 channel
- B.
4 channel
- C.
5 channel
- D.
2 channel
Correct Answer
A. 3 channel -
- 20.
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?
- A.
23
- B.
15
- C.
21
- D.
20
Correct Answer
C. 21 -
- 21.
What is an alternative WLAN channel design that has multiple access points all on the same channel and with the same BSSID?
- A.
Multiple Channel Architecture
- B.
Single-Channel Architecture
- C.
Four channel Plan
- D.
Three Channel Plan
Correct Answer
B. Single-Channel Architecture -
- 22.
What is each layer of multiple APs on a single channel using the same BSSID known as?
- A.
Channel Stacking
- B.
Zero Hand-off
- C.
Channel Blanket
- D.
Single Channel Architecture
Correct Answer
C. Channel Blanket -
- 23.
What mistake is often made when deploying access points?
- A.
Transmitting at full power
- B.
Mismatched power settings
- C.
Hidden node
- D.
Improper Channel reuse
Correct Answer
A. Transmitting at full power -
- 24.
What can Oversized Coverage Cells cause?
- A.
Hidden node problem
- B.
RF interference
- C.
Mismatched Power Settings
- D.
Low SNR
Correct Answer
A. Hidden node problem -
- 25.
What problems do lightning present to WLAN?
- A.
Antenna shifting
- B.
Damage to equipment
- C.
Damage to cables
- D.
Refraction of signal
Correct Answer
B. Damage to equipment -
- 26.
What should be done to prevent damage to equipment from lightning?
- A.
Install drip loops and coax seals
- B.
Install a grid antenna
- C.
Install a radome
- D.
Install lightning arrestors or copper/fiber transceivers
Correct Answer
D. Install lightning arrestors or copper/fiber transceivers -
- 27.
How should wind interference be dealt with?
- A.
Install drip loops
- B.
Get a radome
- C.
Install a grid antenna
- D.
Coax seals
Correct Answer
C. Install a grid antenna -
- 28.
Why does a building with concrete walls need more access points than a building with dry wall?
- A.
Concrete is denser than drywall and attenuates the signal faster
- B.
Concrete deflects the signal back
- C.
Signals cannot pass through concrete
- D.
Drywall never affects a signal
Correct Answer
A. Concrete is denser than drywall and attenuates the signal faster -
- 29.
Air Stratification is another word for what that causes a change in signal?
- A.
Change in wind direction
- B.
Change in air pressure
- C.
Change in air temperature at high altitudes
- D.
Change in wind speed
Correct Answer
C. Change in air temperature at high altitudes -
- 30.
What can Air Stratification cause?
- A.
Damage to cables
- B.
Damage to equipment
- C.
Refraction of signal
- D.
Movement of antenna direction
Correct Answer
C. Refraction of signal -
- 31.
UV rays or exposure to the sun can damage what from too much exposure on a roof?
- A.
Antennas
- B.
Devices
- C.
Connectors
- D.
Cables
Correct Answer
D. Cables -
- 32.
Which of these would NOT affect range in an 802.11 WLAN?
- A.
Transmission power
- B.
CSMA/CA
- C.
Encryption
- D.
Antenna gain
Correct Answer
B. CSMA/CA -
- 33.
Which of these is NOT one of the negative effects of layer 2 retransmissions?
- A.
Decreased range
- B.
Excessive MAC sublayer overhead
- C.
Jitter
- D.
Increased latency
Correct Answer
C. Jitter -
- 34.
Which of these weather conditions is a concern when deploying a long-distance point-to-point bridge link?
- A.
Changes in air temperature
- B.
Wind
- C.
Rain
- D.
Fog
Correct Answer
A. Changes in air temperature -
- 35.
Which of these would NOT effect range in an 802.11 WLAN?
- A.
Wavelength
- B.
Free Space Path Loss
- C.
Trees
- D.
Brick Walls
Correct Answer
C. Trees -
- 36.
What type of interference is caused by destructive multipath?
- A.
Intersymbol
- B.
All-band
- C.
Wideband
- D.
Narrowband
Correct Answer
A. Intersymbol -
- 37.
What is the maximum number of overlapping channels that can be deployed in the 2.4GHz ISM band?
- A.
12
- B.
11
- C.
4
- D.
3
Correct Answer
D. 3 -
- 38.
Which of the following do NOT cause roaming problems?
- A.
Too little cell coverage overlap
- B.
Too much coverage cell overlap
- C.
Free space path loss
- D.
Hidden node
Correct Answer
C. Free space path loss -
- 39.
What is NOT a cause of layer 2 retransmissions?
- A.
Co-Channel Interference
- B.
Low SNR
- C.
RF Interference
- D.
Multipath
Correct Answer
A. Co-Channel Interference -
- 40.
What kind of interference occupies a smaller and finite frequency space?
- A.
RF
- B.
Wideband
- C.
All-Band
- D.
Narrowband
Correct Answer
D. Narrowband -
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Apr 07, 2013Quiz Edited by
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