200-150 Question #235: Real Exam Question with Answer & Explanation

The correct answer is C: Neighbor Discovery Protocol. Neighbor Discovery Protocol (NDP), defined in RFC 4861, is the IPv6 replacement for ARP and also incorporates router discovery functions. NDP uses ICMPv6 messages and serves multiple purposes: Neighbor Solicitation/Advertisement messages allow a host to resolve an IPv6 address to

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Question

In IPv6, which protocol enables a host to determine the link-layer address of the node that it wants to communicate within the local network, and to find out the link-layer address of the router through which it can access a node in an external network?

Options

AAddress Resolution Protocol V6
BMAC Address Discovery Protocol
CNeighbor Discovery Protocol
DAddress Resolution Protocol

Explanation

Neighbor Discovery Protocol (NDP), defined in RFC 4861, is the IPv6 replacement for ARP and also incorporates router discovery functions. NDP uses ICMPv6 messages and serves multiple purposes: Neighbor Solicitation/Advertisement messages allow a host to resolve an IPv6 address to a MAC (link-layer) address on the local link-equivalent to ARP in IPv4. Router Solicitation/Advertisement messages allow hosts to discover routers and default gateways for reaching external networks. 'Address Resolution Protocol' (D) is the IPv4 mechanism and does not operate in IPv6. 'Address Resolution Protocol V6' (A) is not a real protocol name. 'MAC Address Discovery Protocol' (B) does not exist as a standard protocol.

Topics

#IPv6#Neighbor Discovery Protocol#link-layer address resolution#NDP

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