Which option must be disabled in a wireless card configuration to allow only known clients to connect?

To restrict wireless connectivity to only known clients, the correct approach is to enable the "Access List." This feature allows administrators to specify which clients are permitted to connect to the wireless network. When the access list is configured properly, only the devices that are explicitly listed will gain access, while others will be denied access, effectively creating a whitelist of allowed clients.

If the access list is enabled, the wireless network will reject connection attempts from any client that is not part of that predefined list. This is essential for controlling access to the network and ensuring that only authorized devices can connect.

In contrast, the other options relate to different functions or settings that do not directly control connectivity based on client identification. The security profile, for instance, manages encryption and authentication methods but does not restrict access solely based on a list of devices. Default Forward pertains to whether forwarded traffic is allowed through the wireless interface, and Default Authenticate handles the initial connection process without restricting it to known clients only.