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."
300-410 VRF-Lite Practice Question
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
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: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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
Static NAT maps one inside address to one outside address.
✗
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: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 300-410 question in full detail.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 300-410 NAT questions on configuration and troubleshooting.
VRF-Lite — This question tests VRF-Lite — Static NAT maps one inside address to one outside address..
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?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 300-410 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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