Why RIP and BGP are application layer protocols ?

I understand that RIP uses UDP 520 and BGP uses TCP 179 .. but how come books say RIP and BGP are application layer protocols in what sense ?


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Comments

  • The distinction is just as you said.  RIP uses UDP, and BGP uses TCP.  RIP and BGP are each applications (in a way) whose function is to communicate with other routers for the purpose of passing routing information.  OSPF doesn't use UDP or TCP, it is it's own protocol, number 89.  EIGRP doesn't use UDP or TCP, it is it's own protocol, number 88.    

    The whole protocol, non-protocol thing is a little bit of a fuzzy line.  Is ftp an actual protocol?  Or is it an application that uses the TCP protocol with ports 20 and 21?  Is SMTP an actual protocol, or is it an application that uses the TCP protocol with port 25.  Maybe it depends on who you ask, but following with the statement you're asking about, the answer is they are application layer protocols, not independent protocols.

     

     

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