350-501 Networking Practice Question
An SP network is using IS-IS and wants to achieve fast convergence using BFD. Which two statements about BFD in IS-IS are correct?
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 can provide sub-second failure detection for IS-IS adjacencies.
BFD provides fast failure detection (sub-second) and is configured under the interface. IS-IS does not require BFD for normal operation; it's an enhancement.
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 requires IS-IS to be configured with wide metrics.
Why it's wrong here
BFD is independent of metric type.
- ✓
BFD can provide sub-second failure detection for IS-IS adjacencies.
Why this is correct
BFD provides fast detection, typically less than 1 second.
- ✓
BFD can be used with both L1 and L2 adjacencies.
Why this is correct
BFD supports all IS-IS adjacency types.
- ✗
IS-IS BFD configuration is done under the IS-IS router process.
Why it's wrong here
BFD is configured under the interface, not the router process.
- ✗
BFD replaces the need for IS-IS hello packets.
Why it's wrong here
BFD complements hellos; hellos are still needed for adjacency establishment.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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