H12-821_V1.0 · Question #863
The basic header length of IPv6 messages is a fixed value.
The correct answer is A. TRUE. IPv6 was deliberately redesigned with a fixed 40-byte base header, unlike IPv4 whose header length varies (20–60 bytes) due to its Options field. This fixed structure allows routers to process packets faster since they never need to calculate where the header ends. Option B…
Question
Options
- ATRUE
- BFALSE
How the community answered
(36 responses)- A78% (28)
- B22% (8)
Explanation
IPv6 was deliberately redesigned with a fixed 40-byte base header, unlike IPv4 whose header length varies (20–60 bytes) due to its Options field. This fixed structure allows routers to process packets faster since they never need to calculate where the header ends. Option B (FALSE) is incorrect because IPv4 is the protocol with a variable-length header - a common source of confusion since students often conflate the two. Memory tip: Think "6 is fixed, 4 is flexible" - IPv6 traded header flexibility for speed by moving optional data into extension headers that follow the fixed base header.
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