Why are different inter-as and intra-as protocols used in the internet?
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BGP or Border Gateway Protocol is used for inter-AS or Autonomous System protocols. RIP or Router Information Protocol and OSPF or Open Shortest Path First protocol are used for intra-AS protocols.
Inter-AS protocol helps in the controlled distribution of routing information. Intra-AS protocol comprises of the policy issues which play a less important role in choosing routes.
Inter-AS routing is policy-oriented so the performance of the routes used is given secondary importance. Intra-AS focuses on performance.
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