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CISSP study material · question 296 of 500

An engineer asks what value should be given to the includeSubDomains directive to enable it. What does RFC 6797 specify?

  1. It is valueless; its presence alone extends the policy to every subdomain of the host's domain name.
  2. It takes the same number of seconds as max-age.
  3. It takes a boolean of true or false.
  4. It takes a comma-separated list of the subdomains to include.
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Answer: A. It is valueless; its presence alone extends the policy to every subdomain of the host's domain name.

The optional includeSubDomains directive is valueless: if it is present, the policy applies to the host and to any subdomains of the host's domain name.

Source: RFC 6797 (IETF) — RFC 6797 > 6.1.2 The includeSubDomains Directive

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