350-501 MPLS and Segment Routing Practice Question
An MPLS network is experiencing micro-loops during convergence after a link failure. The network uses LDP and IS-IS as IGP. Which of the following solutions can prevent micro-loops during IGP convergence without requiring additional protocols?
⚠ Common exam trap
Cisco often tests the distinction between IGP-integrated solutions (LFA) and overlay protocols (RSVP-TE, BGP), so the trap here is assuming that any fast-reroute mechanism requires an additional protocol like RSVP-TE, when LFA is a native IGP feature.
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
✓
Configure LFA (Loop-Free Alternate) on the IGP.
LFA (Loop-Free Alternate) is a feature built directly into IGPs like IS-IS and OSPF that precomputes a backup next-hop that does not loop back to the failed link. This prevents micro-loops during IGP convergence without requiring any additional protocols such as RSVP-TE or BGP, making it a lightweight, protocol-integrated solution.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Implement MPLS-TE FRR using bypass tunnels.
Why it's wrong here
TE FRR is for RSVP-TE tunnels, not for native LDP/IGP.
- ✗
Enable BGP PIC (Prefix Independent Convergence).
Why it's wrong here
BGP PIC handles BGP routes, not IGP micro-loops.
- ✓
Configure LFA (Loop-Free Alternate) on the IGP.
Why this is correct
LFA computes backup paths that avoid loops during convergence.
- ✗
Deploy RSVP-TE with fast-reroute.
Why it's wrong here
RSVP-TE is a separate protocol, not needed for IGP micro-loop avoidance.
Visual reference
Go deeper
Related to this question
About these practice questions
One of 971 original 350-501 practice questions on Courseiva, each with a full explanation and wrong-answer analysis — not exam dumps or protected exam content. Learn why practice questions differ from exam dumps →
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 350-501 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 350-501 exam.