A technician is tasked with identifying sources of interference affecting the wireless network performance in a corporate environment. Using a WiFi analyzer, what should the technician specifically look for to BEST address this issue?
Finding unauthorized access points
Detection of signal strength fluctuations across the facility
Listing of all Service Set Identifiers (SSIDs) in the corporate environment
Identification of overlapping channels with nearby networks
The correct answer is the identification of overlapping (adjacent) channels that nearby networks are using. Overlapping channels cause adjacent-channel interference, which corrupts frames and degrades throughput. A WiFi analyzer graphically shows which channels each SSID occupies and how wide they are, enabling the technician to select a non-overlapping channel (such as 1, 6, or 11 in the 2.4 GHz band) or adjust channel width to reduce interference. Monitoring only signal-strength fluctuations relates more to coverage, listing SSIDs does not reveal interference sources, and hunting unauthorized access points is primarily a security task-not the immediate cause of performance-impacting radio interference.
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What are overlapping channels in WiFi, and why do they cause interference?
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Why are channels 1, 6, and 11 recommended in the 2.4 GHz band?