H12-821_V1.0 · Question #130
ICMPv6 has two types: Error Messages and Information Messages.
The correct answer is A. TRUE. A (TRUE) is correct because ICMPv6 (Internet Control Message Protocol version 6, defined in RFC 4443) is formally divided into two categories: Error Messages (types 1–127) and Informational Messages (types 128–255). Error messages report problems like unreachable destinations…
Question
Options
- ATRUE
- BFALSE
How the community answered
(51 responses)- A73% (37)
- B27% (14)
Explanation
A (TRUE) is correct because ICMPv6 (Internet Control Message Protocol version 6, defined in RFC 4443) is formally divided into two categories: Error Messages (types 1–127) and Informational Messages (types 128–255). Error messages report problems like unreachable destinations or packet-too-big conditions, while informational messages handle functions like echo request/reply (ping) and neighbor discovery.
B (FALSE) is wrong - this categorization is not an oversimplification or misconception; it is the actual specification defined in RFC 4443, which explicitly reserves type ranges for each category.
Memory tip: Think of the number 128 as the dividing line - ICMPv6 type values 0–127 are Errors, 128–255 are Informational. Since 128 is a clean power of 2, it's easy to anchor in memory.
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