Which routing protocol uses port 520 to provide route and control plane updates?

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Multiple Choice

Which routing protocol uses port 520 to provide route and control plane updates?

Explanation:
Port numbers in routing protocols indicate which protocol is carrying the route information at the transport layer. The protocol that uses UDP port 520 for its route and control plane updates is RIP. RIP sends its updates as UDP datagrams to port 520, and RIP version 2 uses multicast 224.0.0.9 for those updates (while RIP v1 uses broadcast). This differentiates it from other options: BGP uses TCP port 179, IPv4 is the underlying IP protocol (not a routing protocol), and BFD is a fast failure-detection protocol with different behavior and ports. So seeing port 520 points to RIP as the routing protocol providing the updates.

Port numbers in routing protocols indicate which protocol is carrying the route information at the transport layer. The protocol that uses UDP port 520 for its route and control plane updates is RIP. RIP sends its updates as UDP datagrams to port 520, and RIP version 2 uses multicast 224.0.0.9 for those updates (while RIP v1 uses broadcast). This differentiates it from other options: BGP uses TCP port 179, IPv4 is the underlying IP protocol (not a routing protocol), and BFD is a fast failure-detection protocol with different behavior and ports. So seeing port 520 points to RIP as the routing protocol providing the updates.

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