Cisco® CCNA Exam Cram Notes :RADIUS Server(Remote Authentication Dial-In User Service)

VIII. Security Fundamentals

9. RADIUS Server(Remote Authentication Dial-In User Service)

An authentication and accounting system used by many Internet Service Providers (ISPs). When you dial in to the ISP you must enter your username and password. This information is passed to a RADIUS server, which checks that the information is correct, and then authorizes access to the ISP system. RADIUS implements a client/server architecture, where typical client is a router, switch, or AP and the typical server is a Windows or Unix device that is running RADIUS software.

Features of Radius server:

1. Open standard, and widely supported. Note that TACACS+ is a Cisco proprietary standard, but well supported too.

2. Uses UDP port

3. Provides extensive accounting capability when compared with TACACS+ server

4. Only the password is encrypted in packets transiting between the RADIUS server and the client (any device acting as client, such as a router or a switch or a host computer).

5. On the other hand , TACACS+ provides complete encryption for communication between the TACACS+ server and the client.

6. There is a new upgrade expected, named Diameter.

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