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Reasons for the different inter-AS and intra-AS protocol used in the Internet:

1. Policy:

• The policy issues of the inter-AS and the intra-AS leads to the usage of the different inter-AS and intra-AS in the Internet.

• In inter-AS, the traffic originating in each Autonomous System (AS) cannot pass through another specific AS.

• The BGP (Border Gateway Protocol) carries the path attributes and provides for the controlled distribution of routing information leading to the policy-based routing decisions.

• In the Intra-AS routing protocol, the Autonomous System (AS) is under the same administrative control. So, the policy issues play a less important role in choosing routes.

2. Scalability:

• The Scalability is one of the reasons for the usage of the different inter-AS and intra-AS in the Internet.

• The ability to scale and handle the routing among a large number of networks is difficult in the inter-AS routing protocol.

• The ability to scale the routing is less in Intra-AS routing. if there is a large single administrative domain, then it can be divided into smaller AS’s.

3. Performance:

• The inter-AS is the policy-oriented protocol. The policy of the inter-AS dominates the quality and the performance associated with the routes among the AS’s.

• The intra-AS focuses on the performance of the routing on a router because of a single AS.

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