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300-410 Practice Question: Runs the following command to verify DMVPN tunnel…

A network engineer runs the following command to verify DMVPN tunnel status:

R1# show ip nhrp detail

10.0.0.2/32 via Tunnel0

Created: 00:10:15, Expire: 01:49:45 Type: dynamic, Flags: unique registered NBMA: 192.168.1.2 (no socket)

What does this output indicate?

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 10.0.0.2 has registered with the hub and its NBMA address is 192.168.1.2.

The output shows a dynamic NHRP cache entry for a spoke (10.0.0.2) with NBMA address 192.168.1.2, indicating the spoke has registered and the entry is valid.

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 10.0.0.2 has registered with the hub and its NBMA address is 192.168.1.2.

    Why this is correct

    The "unique registered" flag confirms the spoke has successfully registered its protocol address with the hub, and the NBMA field shows its public address as 192.168.1.2. The "(no socket)" entry merely reflects that no active data path is currently open, which does not invalidate the registration itself.

  • ✗

    The spoke 10.0.0.2 is using a static NBMA mapping.

    Why it's wrong here

    The entry is flagged 'dynamic' and shows an expiry timer, indicating it was learned via NHRP registration, not configured statically. It is tempting because static mappings also appear in NHRP tables, but static entries show no expiry and lack the dynamic flag.

  • ✗

    The NHRP entry is about to expire and needs re-registration.

    Why it's wrong here

    The Expire field shows 01:49:45 remaining against a 02:00:00 registration lifetime, so the entry is healthy, not near expiry. Re-registration is only relevant when the remaining time approaches zero, which triggers a NHRP registration request to refresh the mapping.

  • ✗

    The spoke has not registered; the entry is incomplete.

    Why it's wrong here

    The "unique registered" flag confirms the spoke registered successfully, so the entry is complete, not incomplete. The "(no socket)" field reflects a missing NBMA socket, which is expected for a dynamic entry without an active data path. Registration failure would instead show no entry or a non-registered flag.

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Same concept, more angles

1 more way this is tested on 300-410

These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.

Variation 1. 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?

medium
  • A.The spoke is unable to reach the hub; the registration request is being sent but no reply is received.
  • ✓ B.The spoke has successfully registered its tunnel IP 10.0.0.2/32 with the hub at 10.0.0.1.
  • C.The spoke is sending a registration request to 10.0.0.1 but the hub is not responding, causing a timeout.
  • D.The spoke is attempting to register with the wrong hub IP address.

Why B: 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.

JA

Written by Johnson Ajibi, MSc IT Security

Senior Network & Security Engineer · founder of Courseiva

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.