The engineer deployed a wireless environment in the customer's existing network. After completing the AP online and service configuration on the wireless controller, he used the terminal to…

Question

Options

• AAP power supply is insufficient
• BThe AP's radio frequencies are all turned off
• CThe test terminal does not support the currently configured country code
• DThe AP's working channel is a radar channel and needs to be silent for a period of time

• A
  14% (6)
• B
  9% (4)
• C
  5% (2)
• D
  72% (31)

Explanation

Option D is the correct answer (NOT a cause) because DFS (Dynamic Frequency Selection) radar channel silence is a temporary, self-resolving condition - after the mandatory quiet period (CAC, typically 60 seconds), the AP resumes broadcasting normally. A client simply waiting would eventually discover the SSID, so this doesn't explain a persistent inability to find it.

The other three options are genuine, persistent causes:

• A (Insufficient power): An underpowered AP may fail to initialize its radio fully or broadcast too weakly to be detected within range.
• B (Radio frequencies turned off): No radio transmission means no beacon frames, so no SSID is ever advertised - the most direct possible cause.
• C (Terminal doesn't support the country code): Country codes restrict which channels a device is permitted to scan; if the AP broadcasts on a channel outside the terminal's allowed set, the terminal simply won't scan that channel and will never see the SSID.

Memory tip: Think of it as "permanent vs. temporary." Options A, B, and C are configuration or hardware states that persistently block the SSID. Option D is a regulatory timer - the AP eventually broadcasts on its own. On exam questions asking for "NOT a cause," look for the option that is self-correcting rather than broken.

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