Which routing protocol is designed to exchange routing information between different autonomous systems?

The correct answer is the Exterior Gateway Protocol (EGP) because it is specifically designed for routing information between different autonomous systems (AS). Autonomous systems are large networks or groups of networks under a common administration that share a common routing policy. EGP facilitates the exchange of routing information between these autonomous systems, ensuring that data can navigate across different networks effectively.

In contrast, Interior Gateway Protocols (IGPs), such as Routing Information Protocol (RIP) and Open Shortest Path First (OSPF), are used within a single autonomous system to share routing information. They operate internally and are not meant for inter-autonomous system communication.

The Path Vector Protocol is a specific type of routing protocol used in BGP (Border Gateway Protocol), which is actually an instance of EGP. While Path Vector Protocol is related to the functions of EGP, the more direct and recognized term for protocols designed for routing between different autonomous systems is EGP itself.

Enhanced Interior Gateway Routing Protocol (EIGRP) is an advanced version of IGP and operates within a single autonomous system, primarily used for exchanging routing information among routers within that system, thus it is not relevant for routing between different autonomous systems.