Quiz
Wireless Chapter 9
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Fragen in diesem Quiz (20)
1What is the difference between association frames and reassociation frames?
- AAssociation frames are management frames, whereas reassociation frames are control frames
- BAssociation frames are used exclusively for roaming
- CReassociation frames contain the BSSID of the original AP
- DOnly association frames are used to join a BSS
2Which of the following contains only LLC data and the IP packet, but does not include any 802.11 data?
- AMPDU
- BPPDU
- CPSDU
- DMSDU
- EMMPDU
3Which of the following are protection mechanisms?
- ANAV back-off
- BRTS/CTS
- CRTS-to-Self
- DCTS-to-Self
- EWEP encryption
4The presence of what type of transmissions can trigger the protection mechanism within an ERP basic service set?
- AAssociation of an HR-DSSS client
- BAssociation of an ERP-OFDM client
- CHR-DSSS beacon frame
- DERP beacon frame with the NonERP_Present bit set to 1
- EAssociation of an FHSS client
5Which of the following information is included in a probe response frame?
- ATime stamp
- BSupported data rates
- CService set capabilities
- DSSID
- ETraffic indication map
6Which of the following are true about beacon management frames?
- ABeacons can be disabled to hide the network from intruders
- BTime-stamp information is used by the clients to synchronize their clocks
- CIn a BSS, clients share the responsibility of transmitting the beacons
- DBeacons can contain vendor-proprietary information
7If WMM-PS is not supported, after a station see its AID set to 1 in the TIM, what typically is the next frame that the station transmits?
- ACTS
- BPS-Poll
- CATIM
- DACK
8When a station sends an RTS, the Duration/ID field notifies the other stations that they must set their NAV timers to which of the following values?
- A213 microseconds
- BThe time necessary to transmit the DATA and ACK frames
- CThe time necessary to transmit the CTS frame
- DThe time necessary to transmit the CTS, DATA, and ACK frames
9How does a client station indicate that it is using Power Save mode?
- AIt transmits a frame to the AP with the Sleep field set to 1
- BIt transmits a frame to the AP with the Power Management field set to 1
- CUsing DTIM, the AP determines when the client station uses Power Save mode
- DIt doesn't need to, because Power Save mode is the default
10What would cause an 802.11 station to retransmit a unicast frame?
- AThe transmitted unicast frame was corrupted
- BThe ACK frame from the receiver was corrupted
- CThe receiver's buffer was full
- DThe transmitting station will never attempt to retransmit the data frame
- EThe transmitting station will send a retransmit notification
11If a station is in Power Save mode, how does it know that the AP has buffered unicast frames waiting for it?
- ABy examining the PS-Poll frame
- BBy examining the TIM field
- CWhen it receives an ATIM
- DWhen the Power Management bit is set to 1
- EFrom the DTIM interval
12When is an ERP (802.11g) AP required by the IEEE 802.11-2012 standard to respond to probe request frames from nearby HR-DSSS (802.11b) stations?
- AWhen the probe request frames contain a null SSID value
- BWhen the AP supports only ERP-OFDM data rates
- CWhen the AP supports only HR/DSSS data rates
- DWhen the Power Management bit is set to 1
- EWhen the probe request frames contain the correct SSID value
13Which of the following are true about scanning?
- AThere are two types of scanning: passive and active
- BStations must transmit probe requests in order to learn about local APs
- CThe 802.11 standard allows APs to ignore probe requests for security reasons
- DIt is common for stations to continue to send probe requests after being associated to an AP
14Given that an 802.11 MAC header can have as many as four MAC addresses, which type of addresses are not found in an 802.3 MAC header?
- ASA
- BBSSID
- CDA
- DRA
- ETA
15When a client station is first powered on, what is the order of frames generated by the client station and AP?
- AProbe request/response, association request/response, authentication request/response
- BProbe request/response, authentication request/response, association request/response
- CAssociation request/response, authentication request/response, probe request/response
- Dauthentication request/response, , association request/response, probe request/response
16WLAN users have recently complained about gaps in audio and problems with the push-to-talk capabilities with the ACME Company's VoWiFi phones. What could be the cause of this problem?
- AMisconfigured TIM setting
- BMisconfigured DTIM setting
- CMisconfigured ATIM setting
- DMisconfigured BTIM setting
17The WLAN help desk gets a call that all of a sudden, all of the HR-DSSS (802.11b) VoWiFi phones cannot connect to any of the ERP (802.11g) lightweight APs that are managed by a multiple-channel architecture WLAN controller. All the laptops with ERP (802.11g) radios can still connect. What are the possible causes of this problem?
- AThe WLAN admin disabled the 1, 2, 5.5, and 11 Mbps data rates on the controller
- BThe WLAN admin disabled the 6 and 9 Mbps data rates on the controller
- CThe WLAN admin enable the 6 and 9 Mbps data rates on the controller as basic data rates
- DThe WLAN admin configured all the APs on channel 6
18In a multiple-channel architecture, roaming is controlled by the client station and occurs based on a set of proprietary rules determined by the manufacturer of the wireless radio. Which of the following parameters are often used when making the decision to roam?
- AReceived signal level
- BDistance
- CSNR
- DWMM access categories
19What are some of the advantages of using U-APSD and WMM-PS power management over legacy power-management methods?
- AApplications control doze time and trigger frames
- BU-APSD APs transmit all voice and video data immediately
- CThe client does not have to wait for a beacon to request data
- DDownlink traffic is sent in a frame burst
- EData frames are used a trigger frames. PS-Poll frames are not used
20WMM-PS is based on which 802.11-2012 power-management method?
- AS-APSD
- BU-APSD
- CPSMP
- DSM Power Save
- EPS-Poll
Informationen
- Beschreibung
- Quiz am Wireless Chapter 9, erstellt von Kyle Boehmer am 15/10/2018.
- Autor
- Kyle Boehmer
- Sprache
- English
- Aufrufe
- 3
- Bewertung
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