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300-410 Practice Question: Which statement about the Next Hop Resolution…

Which statement about the Next Hop Resolution Protocol (NHRP) in DMVPN is correct regarding the purpose of NHRP Registration Request packets?

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

✓

They are used to register the spoke's tunnel IP and NBMA address with the hub.

NHRP Registration Request packets are sent from spoke routers to the hub to register their tunnel IP address (NHS) and corresponding NBMA address. This allows the hub to build a mapping database for forwarding.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

  • ✗

    They are used to resolve the NBMA address of a destination tunnel IP address.

    Why it's wrong here

    Incorrect. Resolution of NBMA addresses is done via NHRP Resolution Request/Reply, not Registration.

  • ✓

    They are used to register the spoke's tunnel IP and NBMA address with the hub.

    Why this is correct

    Correct. Registration Request packets register the spoke's mapping with the hub.

  • ✗

    They are used to purge outdated NHRP cache entries on the hub.

    Why it's wrong here

    Incorrect. Purge is done via NHRP Purge Request packets.

  • ✗

    They are used to establish an IPsec security association between spokes.

    Why it's wrong here

    Incorrect. IPsec SA establishment is separate and uses IKE, not NHRP.

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Same concept, more angles

2 more ways 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. What is the default authentication type for NHRP in a DMVPN configuration?

easy
  • A.Plaintext password
  • B.MD5 hash
  • ✓ C.No authentication
  • D.IPsec

Why C: By default, NHRP does not use any authentication. Authentication can be configured using the 'ip nhrp authentication' command, but it is disabled by default.

Variation 2. What is the default NHRP holdtime value on a Cisco router?

easy
  • ✓ A.3600 seconds
  • B.1800 seconds
  • C.7200 seconds
  • D.600 seconds

Why A: The default NHRP holdtime is 3600 seconds (1 hour). This value can be modified with the 'ip nhrp holdtime' command.

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.