Explanation
Mobility Express is the ability to use an access point (AP) as a controller instead of a real WLAN controller.
But this solution is only suitable for small to midsize, or multi-site branch locations where you might not want to invest in a dedicated WLC. answer 'Autonomous' Mobility Express WLC can support up to 100 APs.
Mobility Express WLC also uses CAPWAP to communicate to other APs.
Note: Local mode is the most common mode that an AP operates in. This is also the default mode. In local mode, the LAP maintains a CAPWAP (or LWAPP) tunnel to its associated controller.