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# Key Features of RADIUS

There is the list of key features of RADIUS:

- ## Client/Server Model:

  - NAS will work as a client for RADIUS server.

  - RADIUS server is responsible for getting user connection requests, authenticating the user and then returning all configuration information necessary for the client to deliver service to the user.

  - A RADIUD server can act as a proxy client to other RADIUS servers.

- ## Network Security:

  - Transactions between client and server are authenticated through the use of a shared key and this key is never sent over the network.

  - Password is encrypted before sending it over network.

- ## Flexible Authentication Mechanisms:

  RADIUS supports following protocols for authentication purpose:

  - Point-to-Point Protocal - PPP

  - Password authentication protocol - PAP

  - Challenge-handshake authentication protocol - CHAP

  - Simple UNIX Login

- ## Extensible Protocol:

  RADIUS is extensible; most vendors of RADIUS hardware and software implement their own dialects.

- Stateless protocol, Using UDP, Runs at Port 1812.

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