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Question 60 - CWAP-404 discussion

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What does the value of the Listen Interval field in an Association Request frame indicate?

A.
How long a STA performing active scanning will listen for Probe Responses before changing channels
Answers
A.
How long a STA performing active scanning will listen for Probe Responses before changing channels
B.
How often a STA will go off channel to look for other BSSs
Answers
B.
How often a STA will go off channel to look for other BSSs
C.
How often a STA in power save mode wakes up to listen to Beacon frames
Answers
C.
How often a STA in power save mode wakes up to listen to Beacon frames
D.
How long a STA waits for an Ack before retransmitting the frame
Answers
D.
How long a STA waits for an Ack before retransmitting the frame
Suggested answer: C

Explanation:

The value of the Listen Interval field in an Association Request frame indicates how often a STA in power save mode wakes up to listen to Beacon frames. The Listen Interval is expressed in units of Beacon Intervals (typically 100 TU or 102.4 ms). For example, if the Listen Interval is set to 10, it means that the STA will wake up every 10 Beacon Intervals (or about 1 second) to check for buffered frames at the AP. The Listen Interval is used by the AP to determine how long it can hold frames for a STA in power save mode before discarding them .

Reference: CWAP-404 Certified Wireless Analysis Professional Study and Reference Guide, Chapter 6: MAC Sublayer Frame Exchanges, page 197; CWAP-404 Certified Wireless Analysis Professional Study and Reference Guide, Chapter 6: MAC Sublayer Frame Exchanges, page 198.

asked 16/09/2024
Laxman Paudel
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