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300-410 Practice Question: Which RFC defines the IPv6 Neighbor Discovery…

Which RFC defines the IPv6 Neighbor Discovery Protocol that is the basis for many First Hop Security features?

⚠ Common exam trap

Cisco often tests the distinction between the RFC that defines the protocol itself (RFC 4861 for NDP) versus RFCs that define supporting technologies like ICMPv6 (RFC 4443) or addressing (RFC 4291), leading candidates to confuse the foundational RFC with related but separate standards.

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

✓

RFC 4861

RFC 4861 defines the IPv6 Neighbor Discovery Protocol (NDP), which is the foundation for IPv6 First Hop Security (FHS) features. NDP replaces ARP in IPv6 and provides address resolution, router discovery, neighbor unreachability detection, and redirect functions, all of which are leveraged by FHS mechanisms like RA Guard, DHCPv6 Guard, and Source Address Validation Improvement (SAVI).

Answer analysis

Option-by-option breakdown

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

  • ✓

    RFC 4861

    Why this is correct

    RFC 4861 is the standard for IPv6 Neighbor Discovery.

  • ✗

    RFC 2460

    Why it's wrong here

    RFC 2460 defines the IPv6 base protocol.

  • ✗

    RFC 4291

    Why it's wrong here

    RFC 4291 defines IPv6 addressing architecture.

  • ✗

    RFC 4443

    Why it's wrong here

    RFC 4443 defines ICMPv6.

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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.