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Cisco WLC is a wireless LAN controller that is used to manage wireless LAN access points (APs) and provide centralized configuration and management of the wireless network. OpenLap is an open-source implementation of the Lightweight Access Point Protocol (LWAPP), which is a protocol used by Cisco WLC to manage APs. FreeRadius is a free and open-source implementation of the Remote Authentication Dial-In User Service (RADIUS) protocol, which is used for authentication, authorization, and accounting (AAA) in wireless networks.

In a wireless network that uses Cisco WLC, OpenLap is used to communicate between the WLC and the APs, while FreeRadius is used to manage the authentication and authorization of wireless clients. FreeRadius can be integrated with Cisco WLC to provide advanced authentication and authorization features such as dynamic VLAN assignment and per-user bandwidth control.

Overall, the relationship between Cisco WLC, OpenLap, and FreeRadius is that they all work together to provide a comprehensive wireless network solution that includes centralized management, secure authentication and authorization, and advanced features for network administrators.