350-501 Networking Practice Question
An SP engineer configures IS-IS fast convergence mechanisms. Which three techniques help achieve sub-second convergence in IS-IS?
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
✓
Incremental SPF (iSPF)
BFD provides fast failure detection, PRC recalculates only affected routes, and SPF incremental (iSPF) reduces SPF computation. LFA provides fast reroute.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Incremental SPF (iSPF)
Why this is correct
iSPF reduces SPF recomputation.
- ✓
Bidirectional Forwarding Detection (BFD)
Why this is correct
BFD detects link failures in milliseconds.
- ✓
Partial Route Computation (PRC)
Why this is correct
PRC updates only affected prefixes.
- ✗
Full SPF recalculation
Why it's wrong here
Full SPF is slower.
- ✗
LDP label distribution
Why it's wrong here
LDP is not an IS-IS feature.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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