The answer is that the LDP session is flapping due to hold timer expiration. This is correct because the debug output shows the transport connection to peer 2.2.2.2 being established via TCP, but then the hold timer expires, forcing the session to close and immediately attempt reconnection. In MPLS LDP, the hold timer dictates how long a router waits for a keepalive message from its peer; if no keepalive is received within that interval, the session is torn down to prevent stale label bindings. On the Cisco CCNP ENARSI 300-410 exam, this scenario tests your ability to differentiate between a session that never forms and one that flaps due to intermittent keepalive loss—a common trap is confusing hold timer expiration with a failed TCP transport. Remember the memory tip: "Hold timer hits zero, session goes hero" (meaning it resets and tries again), so always check for network congestion or mismatched hello/hold timers when you see this pattern.
300-410 Device Management Practice Question
This 300-410 practice question tests your understanding of device management. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A network engineer runs the following command to troubleshoot an MPLS LDP issue:
R1# debug mpls ldp transport
LDP: Transport connection to 2.2.2.2:0 via TCP (passive)
LDP: Connection from 2.2.2.2:0 to 1.1.1.1:646
LDP: Transport connection to 2.2.2.2:0 via TCP (active)
LDP: Connection from 1.1.1.1:646 to 2.2.2.2:0
LDP: Hold timer expired for peer 2.2.2.2:0
LDP: Closing transport connection to 2.2.2.2:0
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
LDP session is flapping due to hold timer expiration.
The debug shows that the LDP transport connection to peer 2.2.2.2 is established but then the hold timer expires, causing the connection to close. This indicates a problem with LDP keepalive or session maintenance.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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 is established and stable.
Why it's wrong here
The hold timer expires, indicating instability.
✓
LDP session is flapping due to hold timer expiration.
Why this is correct
The hold timer expires, causing the session to close, which suggests flapping.
Related concept
Read the scenario before looking for a memorised answer.
✗
LDP session is down because of authentication failure.
Why it's wrong here
No authentication error is shown.
✗
LDP session is down because of a transport address mismatch.
Why it's wrong here
The transport connection is established, so addresses match.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Trap categories for this question
Command / output trap
No authentication error is shown.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the 300-410 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 300-410 question in full detail.
Identify which 300-410 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Device Management — This question tests Device Management — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: LDP session is flapping due to hold timer expiration. — The debug shows that the LDP transport connection to peer 2.2.2.2 is established but then the hold timer expires, causing the connection to close. This indicates a problem with LDP keepalive or session maintenance.
What should I do if I get this 300-410 question wrong?
Identify which 300-410 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
This 300-410 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 300-410 exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.