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Wireless Chapter 12
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Questions in this quiz (20)
1What are some recommended best practices when deploying a high-density WLAN?
- ADeploying unidirectional MIMO patch antennas
- BBand steering of all clients to 5 GHz
- CLoad balancing
- DLow AP transmit power
- ELayer 3 roaming
2If the access points transmit on the same frequency channel in an MCA architecture, what type of interference is caused by overlapping coverage cells?
- AIntersymbol interference
- BAdjacent channel interference
- CAll-band interference
- DNarrowband interference
- ECo-channel interference
3What variables might affect range in an 802.11 WLAN?
- ATransmission power
- BCSMA/CA
- CEncryption
- DAntenna gain
- EPhysical environment
4What can be done to fix the hidden node problem?
- AIncrease the power on the access point
- BMove the hidden node station
- CIncrease power on all client stations
- DRemove the obstacle
- EDecrease power on the hidden node station
5Layer 2 retransmissions occur when frames become corrupted. What are some of the causes of layer 2 retries?
- AHigh SNR
- BLow SNR
- CCo-channel interference
- DRF interference
- EAdjacent channel interference
6What scenarios might result in a hidden node problem?
- ADistributed antenna system
- BCoverage cells that are too large
- CCoverage cells that are too small
- DPhysical obstruction
- ECo-channel interference
7What are some of the negative effects of layer 2 retransmissions?
- ADecreased range
- BExcessive MAC sublayer overhead
- CDecreased latency
- DIncreased latency
- EJitter
8Several users are complaining that their VoWifi phones keep losing connectivity. The WLAN admin notices that the frame transmissions of the VoWifi phones are corrupted when listened to with a protocol analyzer near the access point but are not corrupted when listened to with the protocol analyzer near the VoWifi phone. What is the most likely cause of this problem?
- ARF interference
- BMultipath
- CHidden node
- DAdjacent channel interference
- EMismatched power settings
9A single user is complaining that her VoWifi phone has choppy audio. The WLAN admin notices that the user's MAC address has a retry rate of 25 percent when observed with a protocol analyzer. However, all the other users have a retry rate of about 5 percent when also observed with the protocol analyzer. What is the most likely cause of this problem?
- ANear/far
- BMultipath
- CCo-channel interference
- DHidden node
- ELow SNR
10What type of interference is caused by overlapping coverage cells with overlapping frequencies?
- AIntersymbol interference
- BAdjacent channel interference
- CAll-band interference
- DNarrowband interference
- ECo-channel interference
11Based on RSSI metrics, concentric zones of variable data rate coverage exist around an access point due to the upshifting and downshifting of client stations between data rates. What is the correct name of this process, according to the IEEE 802.11-2012 standard?
- ADynamic rate shifting
- BDynamic rate switching
- CAutomatic rate selection
- DAdaptive rate selection
- EAll of the above
12Which of these weather conditions is a concern when deploying a long-distance point-to-point bridge link?
- AWind
- BRain
- CFog
- DChanges in air temperature
- EAll of the above
13What variables might affect range in an 802.11 WLAN?
- AWavelength
- BFree space path loss
- CBrick walls
- DTrees
- EAll of the above
14Given: Wi-fi clients can roam seamlessly at layer 2 if all the APs are configured with the same SSID and same security settings. However, if clients cross layer 3 boundaries, a layer 3 roaming solution will be needed. Which device functions as the home agent if a Mobile IP solution has been implemented in an enterprise WLAN environment where no WLAN controller is deployed?
- AWireless network management server
- BAccess layer switch
- CLayer 3 switch
- DAccess point on the original subnet
- EAccess point on the new subnet
15Which of the following can cause roaming problems?
- AToo little cell coverage overlap
- BToo much cell coverage overlap
- CFree space path loss
- DCSMA/CA
- EHidden node
16What are some problems that can occur when an access point is transmitting at full power?
- AHidden node
- BCo-channel interference
- CMismatched power between the AP and the clinets
- DIntersymbol interference
17Why would a WLAN network admin consider disabling the two lowest rates on an 802.11b/g/n access point?
- AMedium contention
- BAdjacent channel interference
- CHidden node
- DIntersymbol interference
- EAll of the above
18Which type of interference is caused by destructive multipath?
- AIntersymbol interference
- BAll-band interference
- CNarrowband interference
- DWideband interference
- EPhysical interference
19In a multiple-channel architecture design, what is the greatest number of nonoverlapping channels that can be deployed in the 2.4 GHz ISM band?
- A3
- B12
- C11
- D14
- E4
20What factors should be taken into consideration when designing a channel reuse plan for 5 GHz access points?
- ARegulatory channels permitted
- BNumber of VLANs permitted
- CEncryption
- DDFS support for the clients
- EDFS support for the APs
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- Description
- Quiz on Wireless Chapter 12, created by Kyle Boehmer on 24/10/2018.
- Author
- Kyle Boehmer
- Language
- English
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