CompTIA Security+ Question G-48

Which of the following can be implemented if a security administrator wants only certain devices connecting to the wireless network?

A. Disable SSID broadcast
B. Install a RADIUS server
C. Enable MAC filtering
D. Lowering power levels on the AP

Answer: C

MAC filtering is commonly used in wireless networks. In computer networking, MAC Filtering (or GUI filtering, or layer 2 address filtering) refers to a security access control method whereby the 48-bit address assigned to each network card is used to determine access to the network. MAC addresses are uniquely assigned to each card, so using MAC filtering on a network permits and denies network access to specific devices through the use of blacklists and whitelists. While the restriction of network access through the use of lists is straightforward, an individual person is not identified by a MAC address, rather a device only, so an authorized person will need to have a whitelist entry for each device that he or she would use to access the network.