Answer: To prevent attackers from seeing the MAC addresses used by legitimate 802.11 WLAN devices, you can utilize MAC address filtering or MAC address privacy techniques.
MAC address filtering: This security measure involves configuring your wireless access point or WLAN controller to allow only specific MAC addresses to connect to the network. By creating an approved list of MAC addresses, you can restrict access to the network to only authorized devices. This prevents attackers from seeing the MAC addresses of legitimate devices since their connection attempts would be denied.
MAC address randomization: MAC address randomization is a technique employed by some devices to enhance privacy. Instead of transmitting the real MAC address, the device generates a random MAC address for each network it connects to. This prevents attackers from tracking and identifying the device based on its MAC address.
By implementing MAC address filtering or enabling MAC address randomization on your WLAN devices, you can enhance the security and privacy of your network by limiting the exposure of MAC addresses to potential attackers.