Final answer:
ICMPv6 does not include all Neighbor Discovery Protocol (NDP) messages.
Step-by-step explanation:
False. ICMPv6 (Internet Control Message Protocol version 6) is a protocol used in IPv6 networks for various network management and error reporting functions. NDP (Neighbor Discovery Protocol) is a separate protocol that operates at the network layer and is responsible for address resolution, router discovery, and neighbor unreachability detection. While ICMPv6 includes some NDP messages, it does not include all of them.