When allowing APs to join a Wireless LAN Controller (WLC) using directed broadcasts on a Cisco IOS switch, the relevant ports are UDP ports 5246 and 5247. These ports are used for CAPWAP (Control and Provisioning of Wireless Access Points) communication between the APs and the WLC.
Specifically:
- **UDP port 5246** is used for CAPWAP control messages.
- **UDP port 5247** is used for CAPWAP data messages.
Given the options provided, the correct answer for the control channel required for APs to join a WLC is:
**A. UDP 5246**
This port is essential for the control messages that facilitate the initial join process of APs to the WLC.
A is right | form OCG p,523
To discover a WLC, an AP sends a unicast CAPWAP Discovery Request to a controller’s IP
address over UDP port 5246 or a broadcast to the local subnet
Discovering Wireless LAN Controller
The AP sends a unicast CAPWAP Discovery Request to a controller’s IP address over UDP port 5246 or a broadcast to the local subnet to find a WLC. The available WLC sends back a CAPWAP Discovery Response. The discovery process involves the following:
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