CAS-003 · Question #913
CAS-003 Question #913: Real Exam Question with Answer & Explanation
The correct answer is D: Change the radio channel to 11, as it has less interference.. The network is on 2.4 GHz Channel 6 with WPA-PSK (WPA2). In the 2.4 GHz band, only channels 1, 6, and 11 are non-overlapping; all other channels bleed into adjacent channels, causing co-channel and adjacent-channel interference. Channel 6 is the factory default for most consumer
Question
Options
- AAvoid using 2 4GHz and prefer 5GHz to minimize interference.
- BDo a site survey to determine the best channel to configure the wireless network.
- CHide the SSID Use WPA3 instead of WPA2.
- DChange the radio channel to 11, as it has less interference.
Explanation
The network is on 2.4 GHz Channel 6 with WPA-PSK (WPA2). In the 2.4 GHz band, only channels 1, 6, and 11 are non-overlapping; all other channels bleed into adjacent channels, causing co-channel and adjacent-channel interference. Channel 6 is the factory default for most consumer routers and is therefore the most congested channel in dense environments. Moving to channel 11 - the third non-overlapping channel - directly reduces co-channel interference and improves stability and performance without requiring hardware changes. Why the others are weaker: A (prefer 5 GHz) is generally good advice but requires hardware support and doesn't resolve the immediate 2.4 GHz channel conflict. B (site survey) is best practice for channel planning but is a diagnostic step, not an immediate mitigation. C (hide SSID + WPA3) - SSID hiding is security theater (the SSID is still broadcast in probe responses and is trivially discoverable), and while WPA3 is a security improvement, it does not address the stability or performance complaints and may break compatibility with older clients.
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