mediumMultiple ChoiceObjective-mapped
300-410 Practice Question: Runs the following command to troubleshoot an…
A network engineer runs the following command to troubleshoot an MPLS Operations issue:
R1# debug mpls ldp transport 10.1.1.1
Output:
*Mar 1 00:01:23.456: LDP: Sent hello to 10.1.1.1 (UDP 646) on GigabitEthernet0/0 *Mar 1 00:01:23.789: LDP: Received hello from 10.1.1.1 (UDP 646) on GigabitEthernet0/0 *Mar 1 00:01:24.012: LDP: Opened TCP connection to 10.1.1.1:646 *Mar 1 00:01:24.345: LDP: Initialization msg sent to 10.1.1.1 *Mar 1 00:01:24.678: LDP: Initialization msg received from 10.1.1.1 *Mar 1 00:01:25.001: LDP: Session with 10.1.1.1:0 (0x1234) is UP
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
✓
LDP session with neighbor 10.1.1.1 is successfully established
The debug output shows the LDP transport session establishment process. The sequence of events indicates a successful LDP session establishment: hello exchange, TCP connection, initialization messages, and session UP.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
LDP session with neighbor 10.1.1.1 is successfully established
Why this is correct
The output shows all steps of LDP session establishment completing successfully, ending with session UP.
- ✗
LDP discovery via multicast hello failed
Why it's wrong here
The output shows successful hello exchange (both sent and received), so discovery succeeded.
- ✗
TCP connection to 10.1.1.1 was refused
Why it's wrong here
The output shows 'Opened TCP connection', indicating the TCP connection was accepted.
- ✗
LDP session is stuck in initialization state
Why it's wrong here
The output shows initialization messages were exchanged and the session went UP, not stuck.
Visual reference
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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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