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Question number: 658

» Basic CS » Networks

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Describe in Detail

What are some of the routing protocols typically is use in a network.



  • Routing Information Protocol used on small or medium sized internal networks

  • Connected to the early Internet.

  • Capable of routing messages across networks up to a maximum of 15 hops.

  • Enabled routers to discover network by first sending a message requesting router tables from neighbouring devices.

  • Neighbour routers running RIP respond by sending the full routing tables back to the requestor the requestor follows an algorithm to merge all of these updates into its own table.


  • Open Shortest Path First was created to overcome limitations of RIP

    • The 15 hop count restriction

    • The inability to organize networks into a routing hierarchy, important for manageability and performance on large internal networks

    • The significant network traffic generated by repeatedly re-sending full router tables at scheduled intervals.

  • OSPF is an open public standard with widespread across many industry vendors.

  • It is the only link state routing protocol listed in this category.


  • Cisco developed Internet Gateway Routing Protocol as another alternative to RIP.

  • The newer Enhanced IGRP made.

  • EIGRP supports classless IP subnets and improves the efficiency of the routing algorithms compared to older IGRP.

  • It does not support routing hierarchies, like RIP.

  • Created as a proprietary protocol runnable only on Cisco family devices.

  • EIGRP was designed with the goals of easier configuration and better performance than OSPF.


  • Functions of The Intermediate System to Intermediate System protocol similarly to OSPF.

  • Remains in widespread use by service providers who benefitted from the protocol being more easily adaptable to their special environments.

  • Not run over Internet Protocol (IP) and uses its own addressing scheme.

BGP and EGP:

  • The Border Gateway Protocol is the Internet standard External Gateway Protocol.

  • Detects modifications to routing tables and selectively communicates those changes to other routers over TCP/IP.

  • Internet providers commonly use BGP to join their networks together.

  • Larger business use BGP to join together multiple of their internal networks.