350-501 Networking Practice Question
An engineer is configuring IS-IS fast convergence. Which mechanism provides sub-second failure detection independently of the routing protocol?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
BFD
BFD (Bidirectional Forwarding Detection) provides fast failure detection at the link layer, triggering routing protocol convergence.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
BFD
Why this is correct
BFD provides sub-second failure detection.
- ✗
LSP fast flooding
Why it's wrong here
Fast flooding helps propagate LSPs quickly but detection is separate.
- ✗
PRC (Partial Route Computation)
Why it's wrong here
PRC is a routing computation optimization, not failure detection.
- ✗
iSPF (incremental SPF)
Why it's wrong here
iSPF reduces SPF computation time but does not detect failures.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 350-501 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 350-501 exam.