The answer is that the NHRP holdtime is too short, causing frequent re-registrations. This is evident from the show ip nhrp output, where each dynamic entry shows an expire timer starting at just two minutes (120 seconds), meaning the router must re-register with the NHS every two minutes to keep the cache alive. In the Cisco CCNP ENARSI 300-410 exam, this scenario tests your ability to interpret NHRP cache timers and recognize that a short holdtime leads to unnecessary control-plane overhead and instability in a DMVPN environment. A common trap is to focus on the NBMA addresses or the “created” timestamps, but the real clue is the rapidly decreasing “expire” value—if it drops below 60 seconds, the holdtime is likely misconfigured. Remember the memory tip: “Expire tells the tale—if it’s too quick, the re-registrations will stick.”
300-410 DMVPN Practice Question
This 300-410 practice question tests your understanding of dmvpn. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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 on Router R1:
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The NHRP holdtime is too short, causing frequent re-registrations.
The output shows NHRP cache entries for remote networks. The expire time is decreasing, indicating these are dynamic entries learned via NHRP. The problem is that the NHRP holdtime is set to 2 minutes (120 seconds), as seen from the expire time starting at 2 minutes. This is a short holdtime that may cause frequent re-registrations.
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.
✓
The NHRP holdtime is too short, causing frequent re-registrations.
Why this is correct
Expire time of 2 minutes indicates a holdtime of 120 seconds, which is low.
Related concept
Read the scenario before looking for a memorised answer.
✗
The NHRP entries are static and will not expire.
Why it's wrong here
Type is dynamic, not static.
✗
The tunnel interface is down.
Why it's wrong here
Entries are present and created recently, tunnel is up.
✗
The NBMA addresses are incorrect.
Why it's wrong here
NBMA addresses are shown and match expected spoke addresses.
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
NBMA addresses are shown and match expected spoke addresses.
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.
DMVPN — This question tests DMVPN — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The NHRP holdtime is too short, causing frequent re-registrations. — The output shows NHRP cache entries for remote networks. The expire time is decreasing, indicating these are dynamic entries learned via NHRP. The problem is that the NHRP holdtime is set to 2 minutes (120 seconds), as seen from the expire time starting at 2 minutes. This is a short holdtime that may cause frequent re-registrations.
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.
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Question Discussion
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