- A
The NHRP mapping is static and was manually configured.
Why wrong: Incorrect. The type is 'dynamic', not static.
- B
The NHRP mapping for 10.6.6.1 is dynamic, with NBMA address 192.168.1.1, and is actively used.
Correct. The output shows a dynamic mapping with NBMA address 192.168.1.1 and the 'used' flag.
- C
The NHRP mapping has expired and needs to be refreshed.
Why wrong: Incorrect. The entry expires in 1:59:00, so it is still valid.
- D
The NHRP mapping is for a multicast group address.
Why wrong: Incorrect. The destination is a unicast address 10.6.6.1/32.
Question 401 of 2,152
Interpreting Dynamic NHRP Mapping in VRF-Lite
This 300-410 practice question tests your understanding of vrf-lite. 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 a VRF-Lite DMVPN issue:
R1# show ip nhrp vrf CUSTOMER_G detail
Output:
10.6.6.1/32 via 10.6.6.1, Tunnel0 created 00:01:00, expire 01:59:00
Type: dynamic, Flags: used NBMA address: 192.168.1.1 (no-socket) Registration handle: 0x00000001 Cache entries: 1
What does this output indicate?
Quick Answer
The answer is that the output indicates a dynamic NHRP mapping for destination 10.6.6.1/32 with NBMA address 192.168.1.1, actively used via Tunnel0. This is correct because the "dynamic" type and "used" flag confirm the spoke-to-spoke or spoke-to-hub mapping was learned through NHRP registration rather than static configuration, and the entry is currently forwarding traffic. On the Cisco CCNP ENARSI 300-410 exam, this question tests your ability to interpret VRF-Lite DMVPN NHRP show command output, specifically distinguishing between dynamic and static mappings in a multi-VRF environment. A common trap is misreading the "no-socket" line—this simply means the NHRP process is not bound to a raw socket for that entry, not that the mapping is broken. Remember the memory tip: "Dynamic and used means the spoke is talking; static and unused means you configured it but nobody called."
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 NHRP mapping for 10.6.6.1 is dynamic, with NBMA address 192.168.1.1, and is actively used.
The 'show ip nhrp vrf detail' command displays NHRP cache entries for a specific VRF. The output shows a dynamic NHRP mapping for destination 10.6.6.1/32, with NBMA address 192.168.1.1, learned via Tunnel0. The entry was created 1 minute ago and will expire in 1 hour 59 minutes. The 'used' flag indicates the mapping is actively being used.
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 mapping is static and was manually configured.
Why it's wrong here
Incorrect. The type is 'dynamic', not static.
- ✓
The NHRP mapping for 10.6.6.1 is dynamic, with NBMA address 192.168.1.1, and is actively used.
Why this is correct
Correct. The output shows a dynamic mapping with NBMA address 192.168.1.1 and the 'used' flag.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The NHRP mapping has expired and needs to be refreshed.
Why it's wrong here
Incorrect. The entry expires in 1:59:00, so it is still valid.
- ✗
The NHRP mapping is for a multicast group address.
Why it's wrong here
Incorrect. The destination is a unicast address 10.6.6.1/32.
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.
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.
What to study next
Got this wrong? Here's your next step.
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.
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FAQ
Questions learners often ask
What does this 300-410 question test?
VRF-Lite — This question tests VRF-Lite — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The NHRP mapping for 10.6.6.1 is dynamic, with NBMA address 192.168.1.1, and is actively used. — The 'show ip nhrp vrf detail' command displays NHRP cache entries for a specific VRF. The output shows a dynamic NHRP mapping for destination 10.6.6.1/32, with NBMA address 192.168.1.1, learned via Tunnel0. The entry was created 1 minute ago and will expire in 1 hour 59 minutes. The 'used' flag indicates the mapping is actively being used.
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
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Last reviewed: Jun 18, 2026
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