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Question 108 - CWNA-109 discussion

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You are performing a post-implementation validation survey. What basic tool can be used to easily locate areas of high co-channel interference?

A.
Throughput tester
Answers
A.
Throughput tester
B.
Laptop-based spectrum analyzer
Answers
B.
Laptop-based spectrum analyzer
C.
Access point spectrum analyzer
Answers
C.
Access point spectrum analyzer
D.
Wi-Fi scanner
Answers
D.
Wi-Fi scanner
Suggested answer: D

Explanation:

A Wi-Fi scanner is a basic tool that can be used to easily locate areas of high co-channel interference. A Wi-Fi scanner is a software application that can run on a laptop, tablet, smartphone, or other device that has a Wi-Fi adapter. A Wi-Fi scanner can scan the wireless environment and display information about the detected access points and client stations, such as their SSID, BSSID, channel, signal strength, security, and data rate. A Wi-Fi scanner can also show the channel utilization and overlap of different access points, which can indicate the level of co-channel interference. Co-channel interference is a type of interference that occurs when multiple access points use the same or adjacent channels within the same coverage area. Co-channel interference can reduce the throughput and performance of the WLAN, as the access points and client stations have to contend for the channel access and avoid collisions. To identify areas of high co-channel interference, a Wi-Fi scanner can be used to measure the signal strength and channel utilization of different access points and compare them with a threshold or a baseline.Alternatively, a Wi-Fi scanner can also use a color-coded heat map to visualize the co-channel interference level in different locations.Reference:1, Chapter 7, page 279;2, Section 4.3

asked 16/09/2024
Aaron Whitlow
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