350-501 Networking Practice Question
Segment Routing with TI-LFA (Topology Independent Loop-Free Alternate) provides fast convergence. Which statement accurately describes TI-LFA?
⚠ Common exam trap
Cisco often tests the distinction between TI-LFA and traditional LFA or RSVP-TE; the trap here is assuming TI-LFA requires a signaling protocol (like RSVP-TE) or that it only protects link failures, when in fact it is topology independent and protects both link and node failures using segment routing.
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
✓
TI-LFA computes a backup path that is guaranteed to be loop-free and topology independent.
TI-LFA (Topology Independent Loop-Free Alternate) computes a backup path that is guaranteed to be loop-free regardless of the network topology, using segment lists (label stacks) to steer traffic around a failure. It does not rely on the presence of a natural loop-free alternate in the IGP topology, making it topology independent. This ensures fast convergence (typically sub-50ms) without requiring signaling protocols like RSVP-TE.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
TI-LFA only protects against link failures, not node failures.
Why it's wrong here
TI-LFA can protect against both link and node failures.
- ✗
TI-LFA uses a pre-computed backup tunnel signaled via RSVP-TE.
Why it's wrong here
TI-LFA is segment routing based, not RSVP.
- ✓
TI-LFA computes a backup path that is guaranteed to be loop-free and topology independent.
Why this is correct
TI-LFA uses post-convergence path and ensures loop avoidance.
- ✗
TI-LFA requires BFD to detect failures.
Why it's wrong here
BFD can be used but is not mandatory; TI-LFA can rely on IGP convergence.
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