Frequent Questions      

CCNP™ Route Practice Questions 


Exam Code 300-101


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Q7. Which of the following are the benefits of OSPF routing over RIP? [Choose all that apply].

A. No hop count limitation

B. Faster convergence

C. Best path selection

D. Support VLSM

  Correct Answer: A, B, C, D



OSPF is a link state technology that uses Dijkstra algorithm to compute routing information. It has the following advantages over Distance Vector protocols such as RIP:
1. Faster convergence: OSPF network converges faster because routing changes are flooded immediately and computer in parallel.
2. Support for VLSM: OSPF supports VLSM. However, please note that RIP version2 also supports VLSM.
3. Network Reachability: RIP networks are limited to 15 hops. Therefore, networks with more than 15 hops can not be reached by RIP by normal means. On the other hand, OSPF has practically no reachability limitation.
4. Metric: RIP uses only hop count for making routing decisions. This may lead to severe problems in some cases, for example, that a route is nearer but is very slow compared to another route with plenty of bandwidth available. OSPF uses "cost" metric to choose best path. Cisco uses "bandwidth" as metric to choose best route.
5. Efficiency: RIP uses routing updates every 30 seconds. OSPF multicasts link-state updates and sends the updates only when there is a change in the network.

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