Quick Answer
The answer is that Router R1 is a hub with two dynamically registered spokes. This is correct because the show dmvpn output explicitly lists the tunnel interface type as “Hub” and displays two NHRP peers with the “D” attribute, indicating they registered dynamically rather than being statically configured. In DMVPN, the hub maintains a static NHRP mapping for itself, while spokes register their NBMA and tunnel addresses dynamically upon connection, which is exactly what the “Attrb” column confirms here. On the Cisco CCNP ENARSI 300-410 exam, this command tests your ability to interpret NHRP peer states and distinguish hub versus spoke roles; a common trap is confusing the “D” attribute for “down” when it actually means “dynamic.” A quick memory tip: “Hub has the Type, Spokes have the D” — the hub’s role is labeled directly, while dynamic entries always belong to spokes.
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:
R1# show dmvpn
Legend: Attrb -> S: Static, D: Dynamic, I: Incomplete N: NATed, L: Local, X: No Socket #Ent -> Number of NHRP entries with same NBMA peer NHS Status: E => Expecting Replies, R => Responding, W => Waiting UpDn Time -> Up or Down Time for a Tunnel ==========================================================================
Interface: Tunnel0, IPv4 NHRP Details
Type:Hub, NHRP Peers:2,
# Ent Peer NBMA Addr Peer Tunnel Addr State UpDn Tm Attrb
----- --------------- ---------------- ----- -------- ----- 1 10.1.1.2 172.16.0.2 UP 00:02:15 D 1 10.1.1.3 172.16.0.3 UP 00:01:45 D
Based on this output, which statement is correct?
Router R1 is a spoke with two hub peers.
Why wrong: The Type:Hub indicates R1 is a hub, not a spoke.
Router R1 is a hub with two dynamically registered spokes.
Type:Hub and two dynamic (D) entries confirm this.
The NHRP peers are static and not dynamic.
Why wrong: Attrb shows D for dynamic, not S for static.
One spoke is experiencing a registration failure.
Why wrong: Both peers are UP, no failure indicated.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Router R1 is a hub with two dynamically registered spokes.
The show dmvpn command displays NHRP peers. The output shows two dynamic peers (D) with their NBMA and tunnel addresses. The hub has two spokes registered, both in UP state. The correct answer identifies the role and peer count.
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
For each option: why learners choose it and why it is or isn't the right answer here.
Router R1 is a spoke with two hub peers.
Why it's wrong here
The Type:Hub indicates R1 is a hub, not a spoke.
Router R1 is a hub with two dynamically registered spokes.
Why this is correct
Type:Hub and two dynamic (D) entries confirm this.
Related concept
Static NAT maps one inside address to one outside address.
The NHRP peers are static and not dynamic.
Why it's wrong here
Attrb shows D for dynamic, not S for static.
One spoke is experiencing a registration failure.
Why it's wrong here
Both peers are UP, no failure indicated.
Common exam traps
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
Attrb shows D for dynamic, not S for static.
Detailed technical explanation
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.
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
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.
What to study next
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.
DMVPN — study guide chapter
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FAQ
DMVPN — This question tests DMVPN — Static NAT maps one inside address to one outside address..
The correct answer is: Router R1 is a hub with two dynamically registered spokes. — The show dmvpn command displays NHRP peers. The output shows two dynamic peers (D) with their NBMA and tunnel addresses. The hub has two spokes registered, both in UP state. The correct answer identifies the role and peer count.
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.
Static NAT maps one inside address to one outside address.
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Variation 1. A network engineer runs the following command on Router R1: R1# show dmvpn detail Legend: Attrb -> S: Static, D: Dynamic, I: Incomplete N: NATed, L: Local, X: No Socket #Ent -> Number of NHRP entries with same NBMA peer NHS Status: E => Expecting Replies, R => Responding, W => Waiting UpDn Time -> Up or Down Time for a Tunnel ========================================================================== Interface: Tunnel0, IPv4 NHRP Details Type:Spoke, NHRP Peers:1, # Ent Peer NBMA Addr Peer Tunnel Addr State UpDn Tm Attrb ----- --------------- ---------------- ----- -------- ----- 1 10.1.1.1 172.16.0.1 UP 00:10:00 S Based on this output, what is the problem?
mediumWhy A: The output shows a spoke router with one NHRP peer (the hub) marked as static (S). The spoke is only seeing the hub, which is normal for a spoke. However, the problem is that the spoke is not seeing any other spokes, which is expected in a DMVPN phase 2 or 3 where spokes should see each other dynamically. But here the peer is static, indicating the spoke is configured with a static NHRP mapping for the hub, and no dynamic spoke-to-spoke tunnels are established.
Last reviewed: Jun 18, 2026
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