mediumMultiple Choice
300-410 Practice Question: Runs the following command to troubleshoot a…
A network engineer runs the following command to troubleshoot a DMVPN spoke not registering with the hub:
R2# debug nhrp
NHRP: Send Registration Request via Tunnel0 10.0.0.2, target 10.0.0.1 NHRP: Receive Registration Reply via Tunnel0 10.0.0.1, src 10.0.0.1, dst 10.0.0.2 NHRP: Registration successful for 10.0.0.2/32 via Tunnel0
What does this output indicate?
⚠ Common exam trap
300-410 often tests whether candidates can read debug output literally — the trap is picking a 'failure' answer when the output clearly shows a successful registration reply.
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
✓
The spoke has successfully registered its tunnel IP 10.0.0.2/32 with the hub at 10.0.0.1.
The debug output shows the spoke sent a Registration Request to the hub at 10.0.0.1 and received a Registration Reply, followed by 'Registration successful for 10.0.0.2/32 via Tunnel0.' This confirms the NHRP registration completed successfully and the spoke's tunnel IP is now known to the hub. There is no timeout or failure in the output.
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 spoke is unable to reach the hub; the registration request is being sent but no reply is received.
Why it's wrong here
The log shows a Registration Reply received from 10.0.0.1 and an explicit 'Registration successful' line, so the hub did respond. This option describes the failure signature of repeated requests with no reply, which is what you would see if NBMA reachability or NHRP authentication were broken.
- ✓
The spoke has successfully registered its tunnel IP 10.0.0.2/32 with the hub at 10.0.0.1.
Why this is correct
The debug output shows the spoke sending a Registration Request to the hub at 10.0.0.1, receiving a Registration Reply, and confirming "Registration successful for 10.0.0.2/32". This directly satisfies the stem's constraint: the spoke's tunnel IP is now registered in the hub's NHRP cache, resolving the registration failure.
- ✗
The spoke is sending a registration request to 10.0.0.1 but the hub is not responding, causing a timeout.
Why it's wrong here
A timeout would appear as repeated Send Registration Request lines with no Receive Registration Reply entry. Here the reply arrives and registration is confirmed successful, so the hub is responding normally and no timeout condition exists.
- ✗
The spoke is attempting to register with the wrong hub IP address.
Why it's wrong here
The request targets 10.0.0.1, the hub's NBMA address, and the reply returns from that same address with registration confirmed. A wrong-hub scenario would show the request aimed at an address that never answers, leaving registration incomplete.
Go deeper
Related to this question
Learn chapter
Device Management and Network Monitoring (SNMP, Syslog, NetFlow)
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
This 300-410 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 300-410 exam.