The routing protocol that was designed and intended for use between different autonomous systems is called ____________________________.

(A) interior gateway protocol
(B) different gateway protocol
(C) autonomous gateway protocol
(D) exterior gateway protocol

exterior gateway protocol is the correct answer. Exterior Gateway Protocol (EGP) is a protocol for exchanging routing information between two neighbor gateway hosts (each with its own router) in a network of autonomous systems. EGP is commonly used between hosts on the Internet to exchange routing table information. The routing table contains a list of known routers, the addresses they can reach, and a cost metric associated with the path to each router so that the best available route is chosen.