350-501 MPLS and Segment Routing Practice Question
Which THREE are valid methods to provide fast convergence in an MPLS/Segment Routing network? (Select three.)
⚠ Common exam trap
Cisco often tests the distinction between IPFRR (which is IP-layer only) and TI-LFA/LFA/RSVP-TE FRR (which are MPLS/Segment Routing-specific), so candidates mistakenly select IPFRR because it sounds similar to LFA, but it does not apply to MPLS/Segment Routing networks.
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
✓
Topology-Independent LFA (TI-LFA)
B is correct because Topology-Independent LFA (TI-LFA) provides fast convergence in Segment Routing networks by computing a backup path that is guaranteed to be loop-free regardless of the network topology. It leverages the Segment Routing data plane to pre-install a repair path using a segment list, enabling sub-50ms failover without relying on IGP 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.
- ✗
BGP Prefix Independent Convergence (PIC)
Why it's wrong here
PIC is for BGP edge convergence, not transport.
- ✓
Topology-Independent LFA (TI-LFA)
Why this is correct
TI-LFA works with SR and provides node/link protection.
- ✓
Loop-Free Alternate (LFA)
Why this is correct
LFA provides link-protection fast reroute.
- ✓
RSVP-TE Fast Reroute (FRR)
Why this is correct
RSVP-TE supports pre-signaled backup tunnels.
- ✗
IP Fast Reroute (IPFRR)
Why it's wrong here
IPFRR is for native IP, not MPLS.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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