Which interface is used for in-band management communications between the WLC and lightweight APs and for inter-controller communication?

Which interface is used for in-band management communications between the WLC and lightweight APs and for inter-controller communication?

• A. Virtual interface
• B. AP manager interface
• C. Management interface
• D. Service port interface

Answer: (C)

The main idea here is that control-plane, in-band management traffic between the WLC and lightweight APs—and the communication between WLCs in a mobility group—travels over the WLC’s management interface. This interface provides the IP path for CAPWAP control messages and state exchanges, isolating management traffic from user data and ensuring reliable coordination across controllers and APs. Think of the management interface as the dedicated highway for how the WLC talks to APs and to peer controllers: it carries the essential control traffic that handles AP join, authentication, roaming state, and inter-controller synchronization. The other interfaces have roles tied to different functions—AP-manager interfaces handle the APs’ CAPWAP tunnel endpoints and related AP management tasks, virtual interfaces host WLANs and their data paths, and the service port is an out-of-band management path. But for in-band management communications and inter-controller messaging, the management interface is the one designed to carry that control traffic.

The main idea here is that control-plane, in-band management traffic between the WLC and lightweight APs—and the communication between WLCs in a mobility group—travels over the WLC’s management interface. This interface provides the IP path for CAPWAP control messages and state exchanges, isolating management traffic from user data and ensuring reliable coordination across controllers and APs.

Think of the management interface as the dedicated highway for how the WLC talks to APs and to peer controllers: it carries the essential control traffic that handles AP join, authentication, roaming state, and inter-controller synchronization. The other interfaces have roles tied to different functions—AP-manager interfaces handle the APs’ CAPWAP tunnel endpoints and related AP management tasks, virtual interfaces host WLANs and their data paths, and the service port is an out-of-band management path. But for in-band management communications and inter-controller messaging, the management interface is the one designed to carry that control traffic.