Remote Authentication Dial-In User Service (RADIUS) and DIAMETER

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Remote Authentication Dial-In User Service (RADIUS) and DIAMETER:

Remote Authentication Dial-In User Service (RADIUS) is a client/server-based system that supports authentication, authorization, and accounting (AAA) services for remote user access while safeguarding the system from unauthorized access.

RADIUS organizes a centralized user administration by keeping record of all user profiles in one location that all remote services have access to. To validate a RADIUS server, user credentials are required. That information is encrypted and sent to the RADIUS server in an Access-Request packet. Once credentials are received, the RADIUS server accepts, rejects or challenges the information. If credentials are accepted, the RADIUS server sends an Access-Accept packet and the user is authenticated. If the credentials are rejected, the RADIUS server sends an Access-Reject packet. If the information is challenged, it sends an Access-Challenge packet that requests additional information from the user the RADIUS server will use for authentication.

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