OSPF Interview Questions and Answers
Freshers / Beginner level questions & answers
Ques 1. What does OSPF stand for?
Open Shortest Path First
Ques 2. What is the purpose of the OSPF hello packets?
Hello packets are used for neighbor discovery and to establish and maintain adjacencies between OSPF routers.
Ques 3. What is the OSPF SPF algorithm?
SPF (Shortest Path First) is the algorithm used by OSPF to calculate the shortest path tree and determine the best routes in the network.
Ques 4. What is OSPF adjacency?
OSPF adjacency is a relationship formed between OSPF routers to exchange routing information. It is established through the OSPF hello protocol.
Ques 5. How does OSPF handle Type 1 and Type 2 LSAs?
Type 1 LSAs represent routers within an area, and Type 2 LSAs represent networks. OSPF routers use these LSAs to build the LSDB.
Ques 6. How does OSPF support authentication?
OSPF supports authentication through plain text, MD5, or SHA algorithms. Authentication is configured at the interface level.
Ques 7. What is the OSPF SPF tree?
The SPF tree is a tree-like structure used by OSPF to determine the best routes. It is built based on the LSDB and is used in the SPF algorithm.
Ques 8. How does OSPF handle router priority in DR/BDR election?
Router priority is a value used in the DR/BDR election process. The router with the highest priority becomes the DR, and the second-highest becomes the BDR.
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