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 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?
The spoke has a static NHRP mapping for the hub, which is correct for phase 1 DMVPN.
In phase 1, spokes only communicate via hub; static mapping is normal.
The spoke has dynamically learned the hub.
Why wrong: Attrb shows S for static, not D.
The hub is not reachable.
Why wrong: State UP indicates reachability.
The spoke is configured as a hub.
Why wrong: Type:Spoke indicates it is a spoke.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
The spoke has a static NHRP mapping for the hub, which is correct for phase 1 DMVPN.
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.
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.
The spoke has a static NHRP mapping for the hub, which is correct for phase 1 DMVPN.
Why this is correct
In phase 1, spokes only communicate via hub; static mapping is normal.
Related concept
Static NAT maps one inside address to one outside address.
The spoke has dynamically learned the hub.
Why it's wrong here
Attrb shows S for static, not D.
The hub is not reachable.
Why it's wrong here
State UP indicates reachability.
The spoke is configured as a hub.
Why it's wrong here
Type:Spoke indicates it is a spoke.
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 S for static, not D.
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.
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FAQ
DMVPN — This question tests DMVPN — Static NAT maps one inside address to one outside address..
The correct answer is: The spoke has a static NHRP mapping for the hub, which is correct for phase 1 DMVPN. — 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.
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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Last reviewed: Jun 18, 2026
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