OSPF Questions et reponses d'entretien
Question 21. What is OSPF Type 3 LSA (Summary LSA)?
Type 3 LSAs are used to advertise summarized routes from one area to another. They are generated by the Area Border Router (ABR).
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Question 22. How does OSPF support authentication?
OSPF supports authentication through plain text, MD5, or SHA algorithms. Authentication is configured at the interface level.
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Question 23. What is OSPF External LSA (Type 5 LSA)?
Type 5 LSAs represent external routes injected into OSPF. They are generated by Autonomous System Boundary Routers (ASBRs).
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Question 24. Explain OSPF LSA flooding mechanism.
LSAs are flooded within an OSPF area to ensure all routers have the same LSDB. OSPF routers use reliable flooding to achieve this.
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Question 25. 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.
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