Interview Questions and Answers
Experienced / Expert level questions & answers
Ques 1. Explain OSPF LSA types and their functions.
OSPF LSAs (Link State Advertisements) include Router LSAs, Network LSAs, Summary LSAs, ASBR Summary LSAs, and External LSAs, each serving a specific purpose in the OSPF network.
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Ques 2. What is OSPF convergence time?
Convergence time is the duration it takes for OSPF routers to update their routing tables after a topology change. OSPF typically has fast convergence due to its incremental SPF algorithm.
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Ques 3. How does OSPF handle network convergence in the presence of a link failure?
OSPF quickly reacts to link failures by recalculating the SPF tree and updating routing tables. This fast convergence is facilitated by OSPF hello and dead interval timers.
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Ques 4. Explain OSPF virtual links.
Virtual links are used to connect non-backbone areas to the OSPF backbone area (Area 0) when a physical connection is not feasible.
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Ques 5. What is OSPF graceful restart?
OSPF graceful restart allows a router to temporarily suspend OSPF routing while still forwarding traffic. It is useful during software upgrades or restarts.
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Ques 6. 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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Ques 7. What is the OSPF LSRefresh timer?
The LSRefresh timer ensures that OSPF routers refresh LSAs with their current age before flooding them. It helps prevent premature aging of LSAs.
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