Which routing protocol can route BETWEEN autonomous systems?

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Multiple Choice

Which routing protocol can route BETWEEN autonomous systems?

Explanation:
Inter-domain routing requires a protocol designed to exchange reachability information between autonomous systems. Border Gateway Protocol is built for that role, functioning as the exterior gateway protocol between ASes. It uses path-vector routing with the AS_PATH attribute to prevent loops and supports policy-based decisions, which lets different networks control how traffic enters or leaves their domain. Inside a single autonomous system, other protocols like OSPF and IS-IS (link-state IGPs) or EIGRP (a Cisco-based distance-vector/advanced IGP) handle routing within that domain, but they aren’t designed to route between different administrative domains. So the protocol that can route between autonomous systems is Border Gateway Protocol.

Inter-domain routing requires a protocol designed to exchange reachability information between autonomous systems. Border Gateway Protocol is built for that role, functioning as the exterior gateway protocol between ASes. It uses path-vector routing with the AS_PATH attribute to prevent loops and supports policy-based decisions, which lets different networks control how traffic enters or leaves their domain. Inside a single autonomous system, other protocols like OSPF and IS-IS (link-state IGPs) or EIGRP (a Cisco-based distance-vector/advanced IGP) handle routing within that domain, but they aren’t designed to route between different administrative domains. So the protocol that can route between autonomous systems is Border Gateway Protocol.

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