Refer to the exhibit. Assuming the WLC's interfaces are not in the same subnet as the RADIUS server, which interface would the WLC use as the source for all RADIUS-related traffic?

The interface specified in the WLAN configuration is primarily associated with wireless client data traffic and is not typically used as the source for the WLC's internal RADIUS authentication requests.

The WLC does not arbitrarily select any configured interface; it uses a specific, designated interface for different types of traffic, with the management interface serving as the default for controller-originated management and authentication traffic.

On a Cisco Wireless LAN Controller (WLC), the management interface is designated as the source IP address for all WLC-originated control and management plane traffic. This includes authentication requests sent to external RADIUS servers, ensuring consistent routing and proper identification for administrative functions.

The controller's virtual interface is a logical interface primarily used for client DHCP proxying, mobility management, and as a default gateway for clients, not as the source for the WLC's own RADIUS communication.