Final answer:
The "on with threshold" setting of the Request to Send/Clear to Send (RTS/CTS) protocol allows the wireless LAN administrator to control the access control for devices connecting to the network.
Step-by-step explanation:
The "on with threshold" setting of the Request to Send/Clear to Send (RTS/CTS) protocol allows the wireless local area network (LAN) administrator to control the access control for devices connecting to the network. When this setting is enabled, devices must send a request to transmit data and receive permission from the network administrator before sending their packets. This helps prevent collisions and ensures that only authorized devices can access the network.