Final answer:
ICMPv6 supports the Neighbor Discovery Protocol (NDP) which is essential for discovering and interacting with neighbor nodes on an IPv6 network.
Step-by-step explanation:
The protocol supported by ICMPv6 to facilitate neighbor discovery on an IPv6 network is ICMPv6 (Internet Control Message Protocol version 6). Unlike its predecessor ICMPv4, which is used with IPv4, ICMPv6 is specifically designed for IPv6. This protocol includes different types of messages, such as Router Solicitation, Router Advertisement, Neighbor Solicitation, and Neighbor Advertisement, which are essential for the operation of the IPv6 protocol. Neighbor Discovery Protocol (NDP) is a subset of ICMPv6 and plays a crucial role in the functionality of IPv6 networks by managing discovery and reachability among neighbor nodes on the same link.