Authentication on WLCs, Layer 2 Solutions:

Excerpt below taken from Authentication on Wireless LAN Controllers Configuration Examples Authentication on WLCs The Cisco Unified Wireless Network (UWN) security solution bundles potentially complicated Layer 1, Layer 2, and Layer 3 802.11 Access Point (AP) security components into a simple policy manager that customizes system-wide security policies on a per-wireless LAN (WLAN) basis.