What is BGP?

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What is BGP?
BGP stands for the ‘Boarder Gateway Protocol. BGP is the exterior gateway protocol that conveys information between routers when connecting to the internet. The routers are owned by different autonomous systems (AS); the separate ownership of routers is how the web is ‘worldwide’. These AS routers are called gateway hosts. The gateway hosts communicate using the Transmission Control Protocol (TPC). When information in changed in a certain set of routers’”referred to as a routing table’”information is sent about the change using TPC.

Unlike the Interior Gateway Protocol (IGP), BGP makes precise decisions based on paths, network policies, and rule sets. The paths, network policies, and rule sets are determined by routing tables. The routers in an autonomous network have two types of routing tables. One is used for the interior gateway protocol, and the other is used for Internal BGP (IBGP). This is because BGP is not very compatible with the Interior Gateway Protocol (IGP).

BGP is the replacement for the Exterior Gateway Protocol (EGP). The change to BGP allowed internet protocol to have complete and whole decentralized routing. The newest version of BGP was made in 1994 and is called BPG4. BGP4 has decreased the size of routing tables by using route aggregation. BGP4 uses Classless Inter-Domain Routing (CIDR); this allows more addresses to exist in an Internet Protocol (IP) address.

In short, BGP makes it possible for internet service providers (ISP) to connect with each other. It also allows end users’”usually the general public’”to access to multiple ISPs. Without BGP, the Internet would not be what it is today: the World Wide Web. This is because there is no other protocol that could deal with a network of this size. Additionally, BGP is able to handle numerous connections to unrelated routing domains.

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