exterior gateway protocols
Exterior Gateway Protocols (EGPs) are used to exchange routing information between different autonomous systems (AS) on the internet. An autonomous system is a collection of IP networks and routers under the control of a single organization. EGPs help ensure that data can travel across various networks efficiently.
The most common EGP is Border Gateway Protocol (BGP), which determines the best paths for data to travel between different AS. BGP uses a path vector mechanism to maintain the path information that gets updated as the network topology changes, ensuring reliable and efficient data transmission across the internet.