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 errors:
R1# debug mpls ldp errors
Output:
*Mar 1 00:01:23.456: LDP: Received malformed hello from 10.0.0.2 *Mar 1 00:01:23.789: LDP: Received malformed initialization from 10.0.0.2 *Mar 1 00:01:24.012: 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 failed due to malformed messages from the neighbor
The debug output shows LDP errors. R1 received malformed hello and initialization messages from neighbor 10.0.0.2, causing the LDP session to go down. This indicates a configuration mismatch or software bug on the neighbor.
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 failed due to malformed messages from the neighbor
Why this is correct
Malformed messages were received, leading to session teardown.
- ✗
The LDP session with 10.0.0.2 is up and stable
Why it's wrong here
The session went DOWN.
- ✗
R1 is sending malformed messages to 10.0.0.2
Why it's wrong here
The errors indicate received malformed messages, not sent.
- ✗
The LDP session is using incorrect transport address
Why it's wrong here
The error is about malformed messages, not transport address.
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
Senior Network & Security Engineer · founder of Courseiva
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