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Question 32 - CWAP-404 discussion

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A client is operating in an unstable RF environment. Out of five data frames transmitted to the client it only receives four. The client sends a Block Ack to acknowledge the receipt of these four frames but due to frame corruption the Block Ack is not received by the AP. Which frames will be retransmitted'

A.
All data frames
Answers
A.
All data frames
B.
Both the corrupted data and Block Ack
Answers
B.
Both the corrupted data and Block Ack
C.
Only the data frame which was corrupted
Answers
C.
Only the data frame which was corrupted
D.
Only the Block Ack
Answers
D.
Only the Block Ack
Suggested answer: A

Explanation:

All data frames will be retransmitted in this scenario. This is because the AP uses a Block Ack (BA) mechanism to acknowledge the receipt of multiple data frames from a client in a single frame. The BA contains a bitmap that indicates which data frames were received correctly and which were not. If the BA is not received by the AP due to frame corruption, the AP will assume that none of the data frames were received by the client and will retransmit all of them. The other options are not correct, as they do not account for the loss of the BA or the use of the bitmap.Reference:[Wireless Analysis Professional Study Guide CWAP-404], Chapter 6: 802.11 Frame Exchanges, page 167-168

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asked 16/09/2024
garima sharma
51 questions
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