Cisco
352-001 · Question #100
352-001 Question #100: Real Exam Question with Answer & Explanation
The correct answer is A: Enable BFD on your routers.. BFD provides sub-second, uniform forwarding-plane failure detection at configurable fixed intervals, making reconvergence times consistent and predictable for all routers in a broadcast domain.
Question
Which technique can you use to detect forwarding path failures at a uniform rate, and reconvergence times will be consistent and predictable when your routers are in the same broadcast domain?
Options
- AEnable BFD on your routers.
- BConfigure your routers with IP-SLA to ping the peer router.
- CConfigure your routers with IP-SLA and track to ping the peer and switch to a default route if the
- DTune your routing protocol timers.
Explanation
BFD provides sub-second, uniform forwarding-plane failure detection at configurable fixed intervals, making reconvergence times consistent and predictable for all routers in a broadcast domain.
Common mistakes.
- B. IP-SLA pings can detect reachability loss but operate outside the forwarding plane, are not natively integrated with routing protocol adjacencies, and do not guarantee uniform detection rates across all routers on a segment.
- C. IP-SLA with object tracking adds route failover capability on top of ping probes but still relies on probe timers rather than forwarding-plane detection, making reconvergence timing less uniform and predictable than BFD.
- D. Tuning routing protocol timers can accelerate hello and dead-interval convergence but varies by protocol implementation and does not provide the sub-second, forwarding-plane-level uniformity that BFD delivers.
Concept tested. BFD for uniform forwarding path failure detection
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