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Question 12 - CWAP-404 discussion

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Using a portable analyzer you perform a packet capture next to a client STA and you can see that the STA is associated to a BSS. You observe the STA sending packets to the AP and the AP sending packets to the ST

A.
Less than 2% of all packets are retransmissions. You move to capture packets by the AP and, while the retry rate is still less than 2%, you now only see unidirectional traffic from the AP to the client. How do you explain this behavior?
Answers
A.
Less than 2% of all packets are retransmissions. You move to capture packets by the AP and, while the retry rate is still less than 2%, you now only see unidirectional traffic from the AP to the client. How do you explain this behavior?
B.
The portable analyzer is too close to the AP causing CCI, blinding the AP to the clients packets
Answers
B.
The portable analyzer is too close to the AP causing CCI, blinding the AP to the clients packets
C.
The STA is transmitting data using more spatial streams than the potable analyzer can support
Answers
C.
The STA is transmitting data using more spatial streams than the potable analyzer can support
D.
There is a transmit power mismatch between the client and the AP and while the client can hear the APs traffic, the AP cannot hear the client
Answers
D.
There is a transmit power mismatch between the client and the AP and while the client can hear the APs traffic, the AP cannot hear the client
E.
The portable analyzer has a lower receive sensitivity than the AP and while it can't capture the packets from the client STA, the AP can receive them OK
Answers
E.
The portable analyzer has a lower receive sensitivity than the AP and while it can't capture the packets from the client STA, the AP can receive them OK
Suggested answer: D

Explanation:

Receive sensitivity is the minimum signal level that a receiver can detect and decode. Different devices may have different receive sensitivity levels depending on their hardware specifications and antenna configurations. In this scenario, the portable analyzer has a lower receive sensitivity than the AP, meaning that it requires a stronger signal to capture the packets from the client STA. The AP, on the other hand, has a higher receive sensitivity and can receive the packets from the client STA even if they have a weaker signal.This explains why the portable analyzer can only see unidirectional traffic from the AP to the client when capturing near the AP5Reference:

CWAP-403 Study Guide, Chapter 4: PHY Layer Analysis, page 121

CWAP-403 Objectives, Section 4.3: Analyze PHY layer metrics

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asked 16/09/2024
Emily Mangrum
34 questions
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