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Before networks became extensive, there was no such thing as interior and exterior gateway

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Before networks became extensive, there was no such thing as interior and exterior gateway protocols. A network simply just ran on a generic routing protocol. This eventually ran into problems so Routing Information Protocol (RIP) was developed and ran as the single routing protocol for many years [1]. As the internet grew, however, this single routing protocol could no longer handle all the traffic. Because of this, over time numerous other routing protocols were developed to meet the needs of routing. One of the numerous gateway protocols that were developed was Border Gateway Protocol (BGP), which is classified as an exterior gateway protocol (EGP).
BGP was developed in January 1989 at the 12th Internet Engineering Task Force Meeting …show more content…

This is done by rejecting any routing update in which a local AS number is contained [2]. If a local AS was accessed and already contained, it tells BGP that the route has already passed through that AS. Additional routing information is found in below.
To complete these tasks successfully, BGP was designed to run over a reliable transport protocol, which is why it uses TCP as it is a connection-oriented protocol (specifically port 179) [2]. TCP also allows eliminates the need for BGP to implement explicit update information, retransmissions, acknowledgements, and sequencing [3].The current version that is being used since roughly 1995 is version 4. This version introduced numerous new BGP features and extensions to allow it to forward routing information to the protocol address families IPv4, IPv6, and CLNS [2]. This way the extensions allow all internet protocols to be valid connecting all networks across the world.

AUTONOMOUS SYSTEMS
An autonomous system is a single routing protocol in a collection of networks with the same routing policy [4]. It can also be defined as a network controlled by a single technical administration entity. They are usually under a single ownership and identified by a unique number. Service providers and enterprise customers such as AT&T are examples of an autonomous system. They are used to divide external global networks into distinct routing domains so that local routing policies can be applied [2]. This simplifies

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