Exterior gateway protocol

This article is about routing protocols used to interconnect network systems. For the specific protocol used on the early Internet, see Exterior Gateway Protocol.

An exterior gateway protocol is a routing protocol used to exchange routing information between autonomous systems. This exchange is crucial for communications across the Internet. Notable exterior gateway protocols include Exterior Gateway Protocol (EGP), now obsolete, and Border Gateway Protocol (BGP).

By contrast, an interior gateway protocol is a type of protocol used for exchanging routing information between gateways (commonly routers) within an autonomous System (for example, a system of corporate local area networks). This routing information can then be used to route network-level protocols like IP.

utilises border gateway protocol:it provides security for the domains in the network,for example if we taken a domain consisting of main router that connects other routers to it the main router acts as a representative or speaker to another domain routers which it also contains a main router they send routing tables etc.