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Computer Networks
OSI/TCP-IP Layers & Routing
GATE 2017
Medium

Consider the following statements about the routing protocols, Routing Information Protocol (RIP) and Open Shortest Path First (OSPF) in an IPv4 network.

I: RIP uses distance vector routing II: RIP packets are sent using UDP III: OSPF packets are sent using TCP IV: OSPF operation is based on link-state routing

Which of the statements above are CORRECT?

  • AI and IV only
  • BI, II and III only
  • I, II and IV only
  • DII, III and IV only

Explanation

RIP is a distance-vector protocol (I, true) that runs over UDP port 520 (II, true). OSPF is link-state (IV, true), but it runs directly over IP (protocol number 89) — NOT over TCP (III, false). So I, II, and IV are correct.

Source: GATE CS 2017 (Session 2) (2017)

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