An exterior gateway protocol is an
IP routing protocol used to exchange
routing information between
autonomous systems. This exchange is crucial for communications across the
Internet
The Internet (or internet) is the global system of interconnected computer networks that uses the Internet protocol suite (TCP/IP) to communicate between networks and devices. It is a '' network of networks'' that consists of private, pub ...
. Notable exterior gateway protocols include
Exterior Gateway Protocol (EGP), now obsolete, and
Border Gateway Protocol
Border Gateway Protocol (BGP) is a standardized exterior gateway protocol designed to exchange routing and reachability information among autonomous systems (AS) on the Internet. BGP is classified as a path-vector routing protocol, and it make ...
(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.
References
Internet protocols
Internet Standards
Routing protocols
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