Which protocol has an administrative distance (AD) of 200?

The protocol with an administrative distance (AD) of 200 is iBGP (Interior Border Gateway Protocol). Administrative distance is a value used by routers to rank the trustworthiness of different routing protocols; a lower AD indicates a more reliable route.

iBGP is used within an autonomous system to exchange routing information between routers running BGP. Its AD of 200 reflects its position in the hierarchy of routing protocols. In contrast, other routing protocols have different values: for example, RIP has an AD of 120, eBGP has an AD of 20, and static routes have an AD of 1. This value signifies that iBGP routes are less preferred than those from eBGP or static routes, making the router prioritize those routing protocols over iBGP when making routing decisions. Understanding administrative distance is crucial for network professionals to troubleshoot and optimize routing in diverse network environments.