hardMultiple Choice
300-410 Practice Question: Runs the following command on Router R1: R1# show…
A network engineer runs the following command on Router R1:
R1# show ip nhrp nhs
NHS: 172.16.0.1 Tunnel0 status: registered NHS: 172.16.0.2 Tunnel0 status: not registered
Based on this output, what is the problem?
⚠ Common exam trap
The trap is assuming that because the tunnel interface is up and one NHS registered, both must be fine — candidates overlook that NHRP registration is per-NHS and can fail independently for one server while succeeding for another.
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
✓
Router R1 is not registered with the second NHS, indicating a registration failure.
The 'show ip nhrp nhs' output lists each Next Hop Server and its registration state. The second NHS (172.16.0.2) shows 'not registered', meaning R1 failed to register with that NHS — typically due to mismatched network-id, missing 'ip nhrp map' entries, or unreachable NHS.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Router R1 is not registered with the second NHS, indicating a registration failure.
Why this is correct
The second NHS at 172.16.0.2 shows "not registered", meaning R1's NHRP registration request to that next-hop server failed or was never acknowledged. This directly satisfies the stem's requirement to identify the problem: R1 has no valid registration with the second NHS, so it cannot resolve mappings through it.
- ✗
Both NHS are registered successfully.
Why it's wrong here
The output shows one NHS registered and one not registered, so claiming both succeeded contradicts the displayed status. It is tempting because the first entry does read registered, but the second entry's 'not registered' state is the actual fault the engineer must troubleshoot.
- ✗
The tunnel interface is down.
Why it's wrong here
A down tunnel interface would prevent both NHS entries from registering, yet 172.16.0.1 shows registered, proving Tunnel0 is up. It is tempting because interface failure commonly causes NHRP registration problems, but here the partial registration points to the second NHS instead.
- ✗
The NHS addresses are swapped.
Why it's wrong here
Swapped addresses would still register both NHS entries if reachable, but the output shows one registered and one not, so ordering is not the fault. It is tempting because misordered NHS statements are a common configuration slip, yet the status column identifies reachability, not sequence.
Go deeper
Related to this question
Learn chapter
ACL-Based Traffic Filtering and Policy-Based Routing
Key term
DMVPN Phase 2
DMVPN Phase 2 is an advanced Cisco routing technology that allows spoke routers to communicate directly with one another without sending traffic through a central hub, using dynamic routing protocols and multipoint GRE tunnels.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Cisco exam blueprint
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