Question

What is 'BGP' (Border Gateway Protocol) and where is it used?

Q: Answer-What is 'BGP' (Border Gateway Protocol) and where is it used?

BGP is an exterior gateway protocol path-vector routing that determines how data is routed across the internet between autonomous systems e.g., ISPs, large enterprises. Each AS has a unique AS Number ASN. BGP selects paths based on policies and attributes AS path, local preference, MED. BGP hijacking is a serious security threat where an AS falsely announces ownership of IP prefixes, potentially redirecting bank traffic. Large banks with their own internet presence manage BGP with their ISPs.