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Module 3: Network Layer & Routing

20162m

Which one of the following is TRUE interior Gateway routing protocols - Routing Information protocol (RIP) and Open Shortest Path First (OSPF)?
(i) RIP uses distance vector routing and OSPF uses link state routing
(ii) OSPF uses distance vector routing and RIP uses link state routing
(iii) Both RIP and OSPF use link state routing
(iv) Both RIP and OSPF use distance vector routing

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Answer: (i) RIP uses distance vector routing and OSPF uses link state routing

Why: RIP periodically exchanges entire routing tables with its neighbours and selects paths by hop count (Bellman-Ford / distance-vector algorithm), whereas OSPF floods link-state advertisements so every router builds a common topology map and runs Dijkstra's SPF algorithm to compute least-cost paths.

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