CWNA Chapter 12
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- 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
- 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
- 3.What form of interference is typically associated with FHSS communications?
- A.
Wideband
- B.
Narrow band
- C.
RF
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 24.What can Oversized Coverage Cells cause?
- A.
Hidden node problem
- B.
RF interference
- C.
Mismatched Power Settings
- D.
Low SNR
- 25.What problems do lightning present to WLAN?
- A.
Antenna shifting
- B.
Damage to equipment
- C.
Damage to cables
- D.
Refraction of signal
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