Open Shortest Path First interview questions part 1
Open Shortest Path First interview questions part 1
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Total Questions: 20
1. Open Shortest Path First (OSPF) is also called as _____________
Correct Answer is : Link state protocol
2. The computation of the shortest path in OSPF is usually done by ____________
Correct Answer is : Dijkstra’s algorithm
3. Which of the following is false with respect to the features of OSPF?
Correct Answer is : Support for fixed-length sunbathing by including the subnet mask in the routing message
4. In OSPF, which protocol is used to discover neighbour routers automatically?
Correct Answer is : Hello protocol
5. Which of the following is not a type of OSPF packet?
Correct Answer is : Link-state response
6. Correct order of the operations of OSPF.
Correct Answer is : 37259
7. In OSPF header, which field is used to detect errors in the packet?
Correct Answer is : Checksum
8. In OSPF database descriptor packet, if more database descriptor packet flows, ‘M’ field is set to ____________
Correct Answer is : 1
9. In OSPF database descriptor packet, which field is used to indicate that the router is master?
Correct Answer is : MS
10. In OSPF database descriptor packet, which field is used to detect a missing packet?
Correct Answer is : Database descriptor sequence number
11. An OSPF router receives an LSA, the router checks its sequence number, and this number matches the sequence number of the LSA that the receiving router already has. What does the receiving router do with the LSA?
Correct Answer is : Ignores the LSA
12. An OSPF router receives an LSA. The router checks its sequence number and finds that this number is higher than the sequence number it already has. Which two tasks does the router perform with the LSA?
Correct Answer is : Adds it to the database
13. An OSPF router receives an LSA. The router checks its sequence number and finds that this number is lower than the sequence number it already has. What does the router do with the LSA?
Correct Answer is : sends newer LSU update to source router
14. Each LSA has its own age timer. By default, how long does an LSA wait before requiring an update?
Correct Answer is : 30 minutes
15. Distance vector protocols use the concept of split horizon, but link-state routing protocols, such as OSPF, do not.
Correct Answer is : FALSE
16. The outcome of Dijkstra’s calculation is used to populate the __________
Correct Answer is : Routing table
17. What is the IP protocol number for OSPF packets?
Correct Answer is : 89
18. Which packet is NOT an OSPF packet type?
Correct Answer is : Query
19. Which multicast address does the OSPF Hello protocol use?
Correct Answer is : 224.0.0.5
20. The Hello protocol sends periodic updates to ensure that a neighbor relationship is maintained between adjacent routers.
Correct Answer is : TRUE
