CompTIA Security+ Question F-17

A security analyst has been tasked with securing a guest wireless network. They recommend the company use an authentication server but are told the funds are not available to set this up.
Which of the following BEST allows the analyst to restrict user access to approved devices?

A. Antenna placement
B. Power level adjustment
C. Disable SSID broadcasting
D. MAC filtering

Answer: D

A MAC filter is a list of authorized wireless client interface MAC addresses that is used by a WAP to block access to all unauthorized devices.