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400-007 · Question #69
400-007 Question #69: Real Exam Question with Answer & Explanation
The correct answer is A: EIGRP with feasible successors. EIGRP with feasible successors pre-computes backup routes that allow immediate failover without reconvergence, ensuring that when one of the two redundant data paths fails, the alternate path continues delivering traffic to host B without loss.
Question
Refer to the exhibit. AJI links are P2P Layer 3. A high availability application is synchronizing data between host A and host B. To increase chance of delivery the same data is sent twice from host A on two different NICs toward the two NICs on host B. Which solution must be deployed in the network to ensure that any failure in the network does not trigger data loss on host B?
Exhibit
Options
- AEIGRP with feasible successors
- BBFD
- CIP Fast Reroute
- DStatic routes
Explanation
EIGRP with feasible successors pre-computes backup routes that allow immediate failover without reconvergence, ensuring that when one of the two redundant data paths fails, the alternate path continues delivering traffic to host B without loss.
Common mistakes.
- B. BFD rapidly detects link failures but does not itself provide redundant routing paths - it must notify a routing protocol to reconverge, introducing delay that can cause data loss.
- C. IP Fast Reroute provides loop-free alternates for fast local repair but coverage depends on topology and does not guarantee pre-computed backups for all failure scenarios.
- D. Static routes have no mechanism to automatically detect or react to topology failures, requiring manual intervention to restore connectivity after a failure.
Concept tested. EIGRP feasible successors for immediate path failover
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