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# What is DIAMETER

- DIAMETER is a planned replacement of RADIUS.

- DIAMETER is a AAA protocol for the applications such as net work access and IP mobility.

- Intended to work in both local & Roaming AAA situations.

- DIAMETER is just twice the predecessor protocol RADIUS.

- Uses TCP or SCTP and not UDP.

- It uses transport level security ( IPSEC or TLS ).

- 32 bit identifier in stead of 8 bit.

- Stateless as well as stateful modes supported.

- Supports application layer acknowledgement, define failover.

- Better roaming support.

- Uses AVPs.

- Easy to extend, new commands and attributes can be defined.

# What is Next ?

Now you have basic understanding of RADIUS & DIAMETER. To go in deeep detail for both the protocols you need to go through various RFCs and other resources mentioned in the next chapter.

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