Which protocol is historically used as an Exterior Gateway Protocol to connect different networks?

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Multiple Choice

Which protocol is historically used as an Exterior Gateway Protocol to connect different networks?

Explanation:
Exchanging routing information between different networks across organizational boundaries is handled by an interdomain routing protocol. BGP is the protocol designed for that job and is historically used as the Exterior Gateway Protocol between autonomous systems. It advertises reachability and uses the AS_PATH attribute to prevent loops, while supporting policy-based decisions that scale to the size of the Internet. This combination—interdomain reachability, scalability, and policy control—makes BGP the correct choice. By contrast, Bidirectional Forwarding Detection is a fast link-failure detector, RIP is an interior gateway protocol used inside a single domain, and IPv4 is the basic network-layer protocol, not a routing protocol.

Exchanging routing information between different networks across organizational boundaries is handled by an interdomain routing protocol. BGP is the protocol designed for that job and is historically used as the Exterior Gateway Protocol between autonomous systems. It advertises reachability and uses the AS_PATH attribute to prevent loops, while supporting policy-based decisions that scale to the size of the Internet. This combination—interdomain reachability, scalability, and policy control—makes BGP the correct choice. By contrast, Bidirectional Forwarding Detection is a fast link-failure detector, RIP is an interior gateway protocol used inside a single domain, and IPv4 is the basic network-layer protocol, not a routing protocol.

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