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352-001 · Question #29
352-001 Question #29: Real Exam Question with Answer & Explanation
The correct answer is A: Add an intra-POP link between routers 1A and 1B, and enable IP LFA FRR.. Adding an intra-POP link between 1A and 1B combined with IP LFA FRR enables pre-computed alternate paths for sub-second failover, directly improving network convergence.
Question
Refer to the exhibit. How would you adjust the design to improve convergence on the network?
Exhibit
Options
- AAdd an intra-POP link between routers 1A and 1B, and enable IP LFA FRR.
- BUse an IP SLA between the end stations to detect path failures.
- CEnable SSO-NSF on routers 1A and 1B.
- DUse BGP to connect the sites over the WAN.
Explanation
Adding an intra-POP link between 1A and 1B combined with IP LFA FRR enables pre-computed alternate paths for sub-second failover, directly improving network convergence.
Common mistakes.
- B. IP SLA monitors path conditions and can trigger route changes, but it detects failures reactively rather than providing pre-computed alternate paths, so it does not meaningfully improve convergence speed.
- C. SSO-NSF (Stateful Switchover with Non-Stop Forwarding) preserves forwarding state during a control-plane restart on a single device but does not address topology convergence for link or node failures.
- D. BGP is inherently slow to converge compared to IGP-level mechanisms like LFA FRR, and routing the WAN with BGP alone would not improve convergence time within the POP.
Concept tested. IP LFA FRR for sub-second convergence
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