350-501 Networking Practice Question
An SP is deploying IS-IS fast convergence. Which mechanism triggers an immediate SPF computation when a neighbor fails?
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 (Bidirectional Forwarding Detection)
BFD (Bidirectional Forwarding Detection) provides sub-second failure detection and triggers SPF/PRC.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Partial Route Computation (PRC)
Why it's wrong here
PRC handles leaf changes, not neighbor failures.
- ✗
Event-driven SPF
Why it's wrong here
Event-driven SPF is a general feature.
- ✗
IS-IS Hello multiplier
Why it's wrong here
Hello multiplier is slower than BFD.
- ✓
BFD (Bidirectional Forwarding Detection)
Why this is correct
BFD detects failures quickly and triggers convergence.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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