- A
The DMVPN tunnel is not functioning because there are only two peers.
Why wrong: Two peers is normal for a hub with two spokes.
- B
Both spoke routers have established dynamic NHRP registrations with the hub.
The state is UP and attribute is D (dynamic).
- C
The hub router has static NHRP entries for the spokes.
Why wrong: The entries are marked D for dynamic.
- D
The spokes are not able to communicate with each other.
Why wrong: This output does not provide information about spoke-to-spoke communication.
Question 441 of 2,152
How to Interpret 'show dmvpn' on a DMVPN Hub
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:
R1# show dmvpn
Legend: Attrb -> S: Static, D: Dynamic, I: Incomplete N: NATed, L: Local, X: No Socket
# Entries: 2 Interface: Tunnel0, IPv4 NHRP Details
Type: Hub, NHRP Peers: 2,
# Ent Peer NBMA Addr Peer Tunnel Addr State UpDn Tm Attrb
----- --------------- --------------- ----- -------- ----- 1 192.168.1.2 10.0.0.2 UP 00:15:30 D 2 192.168.2.2 10.0.0.3 UP 00:14:20 D
Based on this output, which statement is correct?
Quick Answer
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.
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
✓
Both spoke routers have established dynamic NHRP registrations with the hub.
The output shows two dynamic (D) NHRP entries for peers 10.0.0.2 and 10.0.0.3, each with an NBMA address of 192.168.1.2 and 192.168.2.2 respectively. The 'D' attribute indicates these registrations were established dynamically via NHRP registration requests from the spoke routers to the hub, confirming that both spokes have successfully registered with the hub. This is the expected behavior for a DMVPN Phase 2 or Phase 3 hub, where spokes dynamically register their tunnel and NBMA addresses.
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 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
Read the scenario before looking for a memorised answer.
- ✗
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: answer the scenario, not the keyword
Cisco often tests the distinction between the NHRP 'Attrb' column attributes (S, D, I, N, L, X) to trick candidates into misinterpreting dynamic registrations as static or assuming that a hub output showing only hub-spoke entries implies a lack of spoke-to-spoke connectivity.
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
In DMVPN, NHRP (RFC 2332) is used by spokes to register their real (NBMA) and virtual (tunnel) IP addresses with the hub. The 'D' attribute confirms dynamic registration, which is essential for spoke-to-spoke tunnel establishment in Phase 2/3, where spokes query the hub for peer NBMA addresses using NHRP resolution requests. A common real-world issue is misconfigured NHRP authentication or mismatched tunnel keys, which would prevent dynamic registrations and result in 'I' (Incomplete) entries.
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.
TExam Day Tips
- 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
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FAQ
Questions learners often ask
What does this 300-410 question test?
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: Both spoke routers have established dynamic NHRP registrations with the hub. — The output shows two dynamic (D) NHRP entries for peers 10.0.0.2 and 10.0.0.3, each with an NBMA address of 192.168.1.2 and 192.168.2.2 respectively. The 'D' attribute indicates these registrations were established dynamically via NHRP registration requests from the spoke routers to the hub, confirming that both spokes have successfully registered with the hub. This is the expected behavior for a DMVPN Phase 2 or Phase 3 hub, where spokes dynamically register their tunnel and NBMA addresses.
What should I do if I get this 300-410 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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