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CISSP study material · question 307 of 500

Which fields does the fixed IPv6 header carry before the source and destination addresses? Choose three.

  1. Payload length, next header and hop limit.
  2. Header checksum and options.
  3. Version and traffic class.
  4. A 20-bit flow label.
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Answer: D. A 20-bit flow label.
A. Payload length, next header and hop limit.
C. Version and traffic class.

The IPv6 header carries version, traffic class, a 20-bit flow label, payload length, next header and hop limit, then the addresses. IPv6 has no header checksum field.

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

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