Question: Explain in few sentences Why both intra-AS and inter-AS routing protocols are needed? i.e. why one of them alone is not sufficient? Why several intra-AS

Explain in few sentences

  1. Why both intra-AS and inter-AS routing protocols are needed? i.e. why one of them alone is not sufficient?
  2. Why several intra-AS routing protocols exist?
  3. Why only one inter-AS routing protocol is used over Internet?

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