The answer is that both spoke routers have established dynamic NHRP registrations with the hub. This is correct because the "show dmvpn" output displays two entries under the hub’s Tunnel0 interface, each with an "Attrb" of "D" for Dynamic, a Peer Tunnel Addr of 10.0.0.2 and 10.0.0.3, and a State of UP, confirming that both spokes successfully registered their real (NBMA) addresses with the hub via NHRP. On the Cisco CCNP ENARSI 300-410 exam, this command tests your ability to interpret DMVPN hub-and-spoke topology health, often appearing in troubleshooting scenarios where a spoke might show "Incomplete" or "Static" instead of "UP/Dynamic." A common trap is mistaking the Peer NBMA Addr for the tunnel address—remember the NBMA address is the physical transport IP, while the Peer Tunnel Addr is the logical DMVPN network IP. Memory tip: "D for Dynamic, UP for happy" — if you see "D" and "UP," the spoke has registered correctly.
300-410 Device Management Practice Question
This 300-410 practice question tests your understanding of device management. 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
✓
Both spoke routers have established dynamic NHRP registrations with the hub.
The output shows a DMVPN hub with two dynamic peers (spokes) that are both UP. The hub has NHRP peers, and the entries are dynamic (D). This is normal operation.
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 DMVPN tunnel is not functioning because there are only two peers.
Why it's wrong here
Two peers is normal for a hub with two spokes.
✓
Both spoke routers have established dynamic NHRP registrations with the hub.
Why this is correct
The state is UP and attribute is D (dynamic).
Related concept
Static NAT maps one inside address to one outside address.
✗
The hub router has static NHRP entries for the spokes.
Why it's wrong here
The entries are marked D for dynamic.
✗
The spokes are not able to communicate with each other.
Why it's wrong here
This output does not provide information about spoke-to-spoke communication.
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.
Trap categories for this question
Command / output trap
This output does not provide information about spoke-to-spoke communication.
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.
Device Management — This question tests Device Management — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Both spoke routers have established dynamic NHRP registrations with the hub. — The output shows a DMVPN hub with two dynamic peers (spokes) that are both UP. The hub has NHRP peers, and the entries are dynamic (D). This is normal operation.
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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Question Discussion
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