BGP
BGP (Border Gateway Protocol) is a standardized exterior gateway protocol designed to exchange routing and reachability information between autonomous systems (AS) on the Internet. It enables routers to make decisions about the best paths for data packets based on policies, network performance, and rules, forming the backbone of global Internet routing. BGP is a path vector protocol that maintains a table of IP networks or 'prefixes' and uses attributes like AS_PATH and NEXT_HOP to determine optimal routes.
Developers should learn BGP when working in network engineering, cloud infrastructure, or large-scale distributed systems where inter-domain routing is critical, such as in Internet Service Providers (ISPs), data centers, or multi-cloud environments. It is essential for implementing redundancy, traffic engineering, and ensuring reliable connectivity across different networks, as BGP handles the routing decisions that connect disparate networks globally.