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Question 49 - CWAP-404 discussion

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Which one of the following statements is not true concerning DTIMs?

A.
Buffered Broadcast and Multicast traffic will be transmitted following a DTIM
Answers
A.
Buffered Broadcast and Multicast traffic will be transmitted following a DTIM
B.
The DTIM interval can dictate when an STA will wake up to listen to beacon frames
Answers
B.
The DTIM interval can dictate when an STA will wake up to listen to beacon frames
C.
DTIM stands for Delivery Traffic Indication Map
Answers
C.
DTIM stands for Delivery Traffic Indication Map
D.
Every Beacon frame must contain a DTIM
Answers
D.
Every Beacon frame must contain a DTIM
Suggested answer: D

Explanation:

Every Beacon frame must contain a DTIM is not a true statement concerning DTIMs. DTIM stands for Delivery Traffic Indication Message, and it is a subfield within the TIM (Traffic Indication Map) element in a Beacon frame. The DTIM indicates how many Beacon frames (including the current one) will appear before the next DTIM. For example, if the DTIM interval is set to 3, it means that every third Beacon frame will contain a DTIM. Buffered broadcast and multicast traffic will be transmitted following a DTIM, so that STAs in power save mode can wake up and receive them. The DTIM interval can also dictate when an STA will wake up to listen to Beacon frames, as some STAs may choose to only listen to Beacon frames that contain a DTIM .

Reference: CWAP-404 Certified Wireless Analysis Professional Study and Reference Guide, Chapter 6: MAC Sublayer Frame Exchanges, page 200; CWAP-404 Certified Wireless Analysis Professional Study and Reference Guide, Chapter 6: MAC Sublayer Frame Exchanges, page 201.

asked 16/09/2024
Andrew dela Cruz
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