220-802 Question #690: Real Exam Question with Answer & Explanation

The correct answer is A: Enable MAC filtering. Enabling MAC filtering (A) is the best solution because it allows the administrator to explicitly whitelist known devices by their MAC address, blocking any device not on the approved list - including the unknown device. Option B (change the channel) only shifts the wireless freq

Question

An unknown device has been found on a SOHO wireless router. Which of the following is BEST to perform to keep this device off the network?

Options

AEnable MAC filtering
BChange the channel
CDisable DHCP
DDisable SSID broadcast

Explanation

Enabling MAC filtering (A) is the best solution because it allows the administrator to explicitly whitelist known devices by their MAC address, blocking any device not on the approved list - including the unknown device. Option B (change the channel) only shifts the wireless frequency band and does nothing to block a specific device. Option C (disable DHCP) prevents automatic IP assignment, but an attacker can manually assign a static IP and still connect. Option D (disable SSID broadcast) hides the network name but does not prevent a determined user from discovering and connecting to the network - SSID hiding is security through obscurity and is not a reliable access control.

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