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Question 21 - CWAP-404 discussion

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A manufacturing facility has installed a new automation system which incorporates an 802.11 wireless network. The automation system is controlled from tablet computers connected via the WLAN. However, the automation system has not gone live due to problem with the tablets connecting to the WLAN. The WLAN vendor has been onsite to perform a survey and confirmed good primary and secondary coverage across the facility. As a CWAP you are called in to perform Spectrum Analysis to identify any interference sources. From the spectrum analysis, you did not identify any interference sources but were able to correctly identify the issue. Which of the following issues did you identify from the spectrum analysis?

A.
The tablets are connecting to the wrong SSID
Answers
A.
The tablets are connecting to the wrong SSID
B.
The tablets are entering power save mode and failing to wake up to receive the access points transmissions
Answers
B.
The tablets are entering power save mode and failing to wake up to receive the access points transmissions
C.
A high noise floor has resulted in a SNR of less than 20dB
Answers
C.
A high noise floor has resulted in a SNR of less than 20dB
D.
There is a power mismatch between the APs and the clients
Answers
D.
There is a power mismatch between the APs and the clients
Suggested answer: D

Explanation:

The most likely issue that can be identified from the spectrum analysis is a power mismatch between the APs and the clients. A power mismatch occurs when the APs transmit at a higher power level than the clients, or vice versa. This can cause asymmetric communication, where one side can hear the other, but not vice versa. This can result in poor performance, disconnections, or packet loss. A spectrum analysis can reveal a power mismatch by showing different signal amplitudes or RSSI values for the APs and the clients on the same channel or frequency. The other options are not correct, as they cannot be identified from the spectrum analysis alone. The tablets' SSID, power save mode, and noise floor can be determined by using other tools or methods, such as protocol analysis, site survey, or device configuration.Reference:[Wireless Analysis Professional Study Guide CWAP-404], Chapter 3: Spectrum Analysis, page 79-80

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asked 16/09/2024
Kostiantyn Lazurenko
44 questions
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