Configuring MAC Filtering will only allow approved MAC Addresses to connect to the router. This is the BEST option of those given, CompTIA questions are often worded like this. In reality the best option would be to change the WiFi password and verify the encryption settings first, but this was not an option.
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What is MAC filtering and how does it secure a network?
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Why isn’t disabling SSID broadcast sufficient for network security?
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Why is changing the Wi-Fi password and encryption settings the more secure option?