IGP vs EGP

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IGP vs EGP

IGP vs EGP

This lesson covers IGP vs EGP. IGP stands for Interior Gateway Protocol and is found inside an autonomous network. EGP stands for Exterior Gateway Protocol and is used for connecting external networks and routers.  EGP utilizes Border Gateway Protocol (BGP) and Path Vector protocol and is similar to distance vector except there is only one ‘speaker’ node per domain to talk to the other speaker nodes, which reduces traffic and helps manage information sent out over the exterior. There are five Exterior Gateway Protocols:

Routing Information Protocol (RIP): this is a distance vector and relies on hop count. However, this is limited as it can handle no more than 15 hops and cannot handle classless IP addressing.

RIPv2: This is also a distance vector protocol, however it has support for more hops so it can offer support for classless addressing.

Open Shortest Path First (OSPF): This is the most used; it is link state analysis and cost based, it can handle classless addressing.

Interior Gateway Routing Protocol (IGRP): This is a CISCO based distance vector and has more hops than RIP but it still cannot handle classless addresses.

Enhanced Interior Gateway Routing Protocol (EIGRP): This is a CISCO hybrid and an enhanced version of IGRP, it supports classless addresses.

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