Which range defines ICMPv6 error messages?

Which range defines ICMPv6 error messages?

• A. ICMPv6 error messages have types 0-127
• B. ICMPv6 Messages 128-255
• C. ICMPv6 Administrative Messages
• D. ICMPv6 Control Messages

Answer: (A)

In ICMPv6, the Type field identifies what each message is about. Messages that report problems with delivery or processing are assigned in the lower half of the type values, specifically 0 through 127. The upper half, 128 through 255, carries informational, request, or normal diagnostic messages (for example, Echo Request/Reply and router discovery). Because error reports live in the 0–127 range, that is the range that defines ICMPv6 error messages, making this option the best choice.

In ICMPv6, the Type field identifies what each message is about. Messages that report problems with delivery or processing are assigned in the lower half of the type values, specifically 0 through 127. The upper half, 128 through 255, carries informational, request, or normal diagnostic messages (for example, Echo Request/Reply and router discovery). Because error reports live in the 0–127 range, that is the range that defines ICMPv6 error messages, making this option the best choice.