Practice question

Which range defines ICMPv6 informational messages?

  1. ICMPv6 Error Messages
  2. ICMPv6 Messages 128-255
  3. ICMPv6 Status Messages
  4. ICMPv6 Informational Notices

Answer: B — ICMPv6 Messages 128-255

ICMPv6 uses the Type field to distinguish different message kinds, and the set of messages from 128 to 255 is designated for informational/operational purposes. This range includes common tasks like Echo Request/Reply (used by ping in IPv6), Router Solicitation, Router Advertisement, and Neighbor Discovery messages. The lower range (0 to 127) is used for error and diagnostic messages, not informational ones. So, the range that defines ICMPv6 informational messages is 128 to 255.

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