350-501 MPLS and Segment Routing Practice Question
An engineer is troubleshooting an MPLS network where some routers are not exchanging labels via LDP. Which two steps are most appropriate for diagnosing the issue? (Choose two.)
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
✓
Verify LDP neighbor adjacencies using 'show mpls ldp neighbor'.
Verifying LDP sessions with 'show mpls ldp neighbor' and checking interfaces with 'show mpls ldp interface' are standard first steps. Checking MTU or OSPF neighbors are less direct.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Verify LDP neighbor adjacencies using 'show mpls ldp neighbor'.
Why this is correct
Correct: This confirms session state.
- ✗
Check the MTU size on all interfaces.
Why it's wrong here
MTU issues can cause problems but are not the first step.
- ✗
Reboot all routers to reset LDP sessions.
Why it's wrong here
Rebooting is drastic and not a diagnostic step.
- ✗
Verify that OSPF neighbor relationships are established.
Why it's wrong here
LDP relies on reachability, but OSPF is not directly checked for LDP.
- ✓
Ensure that 'mpls ip' is enabled on the interfaces using 'show mpls ldp interface'.
Why this is correct
Correct: This verifies LDP is enabled on interfaces.
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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.