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CISSP study material · question 308 of 500

An engineer computes an IPv6 packet's payload length excluding its extension headers. Why is that wrong?

  1. Extension headers count as part of the payload and are included in the octet count.
  2. Extension headers are counted separately in the next header field.
  3. Payload length is measured in 32-bit words rather than octets.
  4. Payload length counts only the transport segment, excluding both header types.
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Answer: A. Extension headers count as part of the payload and are included in the octet count.

RFC 8200 notes that any extension headers present are considered part of the payload, so they are included in the payload length count.

Source: RFC 8200 (IETF) — RFC 8200 > 3. IPv6 Header Format

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