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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
192.168.1.0/24 via 172.16.0.2

Tunnel0 created 00:00:15, expire 00:01:45 Type: dynamic, Flags: unique NBMA address: 10.1.1.2

192.168.2.0/24 via 172.16.0.3

Tunnel0 created 00:00:10, expire 00:01:50 Type: dynamic, Flags: unique NBMA address: 10.1.1.3

Based on this output, what is the problem?

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 NHRP holdtime is too short, causing frequent re-registrations.

The output shows NHRP cache entries for remote networks. The expire time is decreasing, indicating these are dynamic entries learned via NHRP. The problem is that the NHRP holdtime is set to 2 minutes (120 seconds), as seen from the expire time starting at 2 minutes. This is a short holdtime that may cause frequent re-registrations.

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 NHRP holdtime is too short, causing frequent re-registrations.

    Why this is correct

    Expire time of 2 minutes indicates a holdtime of 120 seconds, which is low.

  • ✗

    The NHRP entries are static and will not expire.

    Why it's wrong here

    Type is dynamic, not static.

  • ✗

    The tunnel interface is down.

    Why it's wrong here

    Entries are present and created recently, tunnel is up.

  • ✗

    The NBMA addresses are incorrect.

    Why it's wrong here

    NBMA addresses are shown and match expected spoke addresses.

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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.