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CISSP study material · question 355 of 500

A resource server accepts JSON web tokens up to an hour past their expiry to accommodate clock differences between hosts. What does RFC 7519 permit?

  1. Leeway of up to one hour, provided the issuer and audience share a time source.
  2. Some small leeway, usually no more than a few minutes, for clock skew.
  3. Leeway equal to the token's original lifetime.
  4. No leeway at all; the token must be rejected at the stated instant.
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Answer: B. Some small leeway, usually no more than a few minutes, for clock skew.

The moment of use must fall before the stated expiry, though a few minutes of tolerance for clocks that disagree is considered reasonable.

Source: RFC 7519 (IETF) — RFC 7519 > 4.1.4 exp (Expiration Time) Claim

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