Neighbor Solicitation ICMPv6 Type and Destination IPv6 Address
Question
What is the ICMPv6 type and destination IPv6 address for a Neighbor Solicitation packet that is sent by a router that wants to learn about a newly introduced network device?
Answers
Explanations
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A. B. C. D. E. F.E.
In IPv6, Neighbor Discovery Protocol (NDP) replaces the functionality of Address Resolution Protocol (ARP) in IPv4. It is responsible for discovering the link-layer addresses of neighboring nodes, and it provides functions for nodes to discover routers and for routers to discover other routers on the same link. NDP messages are carried in ICMPv6 packets.
When a router wants to learn about a newly introduced network device, it sends a Neighbor Solicitation message. This message is sent to the Solicited-Node multicast address, which is a multicast group address that is derived from the device's IPv6 address. The Solicited-Node multicast address is used to reach a specific node on a local network segment.
The ICMPv6 type for Neighbor Solicitation messages is 135. Therefore, options B and E can be eliminated.
The destination address of a Neighbor Solicitation message sent by a router that wants to learn about a newly introduced network device is not the All-Routers multicast address (option C), because this address is used for sending messages to all routers on a network segment.
Option D can also be eliminated because the destination address for a Neighbor Solicitation message sent by a router that wants to learn about a newly introduced network device is not the All-Routers multicast address, but the Solicited-Node multicast address.
Option F can also be eliminated because the destination address for a Neighbor Solicitation message sent by a router that wants to learn about a newly introduced network device is not the Broadcast address, but the Solicited-Node multicast address.
Therefore, the correct answer is option A: ICMP type 136 and the Solicited-Node multicast address.
