hardMultiple ChoiceObjective-mapped
300-410 Practice Question: Runs the following command to debug MPLS LDP…
A network engineer runs the following command to debug MPLS LDP session establishment:
R1# debug mpls ldp session
Output:
*Mar 1 00:01:23.456: LDP: Session with 10.0.0.2:0 (0x1234) is UP *Mar 1 00:01:24.567: LDP: Session with 10.0.0.2:0 (0x1234) is DOWN *Mar 1 00:01:25.678: LDP: Session with 10.0.0.2:0 (0x1234) is UP *Mar 1 00:01:26.789: LDP: Session with 10.0.0.2:0 (0x1234) is DOWN
What does this output indicate?
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
✓
The LDP session with 10.0.0.2 is flapping
The debug output shows the LDP session with neighbor 10.0.0.2 is flapping (repeatedly going UP and DOWN). This indicates instability in the LDP session.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The LDP session with 10.0.0.2 is flapping
Why this is correct
The session repeatedly transitions between UP and DOWN states, indicating flapping.
- ✗
The LDP session with 10.0.0.2 is stable
Why it's wrong here
The session is not stable; it goes down and up repeatedly.
- ✗
The LDP session with 10.0.0.2 is using targeted hello
Why it's wrong here
The debug output does not indicate the hello type.
- ✗
The LDP session with 10.0.0.2 is down permanently
Why it's wrong here
The session comes up multiple times, so it is not permanently down.
Go deeper
Related to this question
Learn chapter
Introduction to ENARSI Exam and Network Fundamentals
Key term
LDP Protocol
LDP, or Label Distribution Protocol, is a protocol that routers use to automatically exchange labels that enable MPLS (Multiprotocol Label Switching) to create fast, efficient paths for data packets across a network.
Key term
MPLS Label Distribution
MPLS Label Distribution is the process by which routers exchange labels that tell them how to forward packets across a network without looking at the IP address each time.
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Written by Johnson Ajibi, MSc IT Security
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