The Remote Authentication Dial-In User Service (RADIUS) provides authentication to clients that connect to a remote access server by using a SLIP or PPP dialup connection and an authentication protocol such as PAP, CHAP, or EAP. It allows a Network Access Server (NAS), which can be a remote access server, router, or wireless access point for example, to delegate the task of authenticating clients to a centralized RADIUS server. When a user dials in to a remote access server, the remote access server acts as a RADIUS client and forwards the access request to the RADIUS server.

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