Comprehensive and Detailed in Depth Explanation:
Vault tokens have a Time-To-Live (TTL) that determines their expiration time, after which they are revoked.
Parent-child relationships mean that revoking a parent token also revokes its children, regardless of their TTLs. Let's analyze:
* A: TTL 4 hours- Expires after 4 hours, no children listed.
* B: TTL 6 hours- Expires after 6 hours, parent to C.
* C: TTL 4 hours (child of B)- Expires after 4 hours or if B is revoked earlier.
* D: TTL 3 hours- Expires after 3 hours, parent to E.
* E: TTL 5 hours (child of D)- Expires after 5 hours or if D is revoked earlier.
Analysis:
* Shortest TTL is D (3 hours), so it expires first unless a parent above it (none listed) is revoked sooner.
* E (5 hours) is a child of D. If D is revoked at 3 hours, E is also revoked, despite its longer TTL.
* A and C (4 hours) expire after D.
* B (6 hours) expires last among parents.
The question asks which token(s) are revoked first based on TTL alone, not manual revocation. D has the shortest TTL (3 hours) and will be revoked first. E's revocation depends on D, but the question focuses on initial expiration. Thus, only D is revoked first based on its TTL.
Overall Explanation from Vault Docs:
Tokens form a hierarchy where child tokens inherit revocation from their parents. "When a parent token is revoked, all of its child tokens-and all of their leases-are revoked as well." TTL dictates automatic expiration unless overridden by manual revocation or parent revocation. Here, D's 3-hour TTL is the shortest, making it the first to expire naturally.
Reference:https://developer.hashicorp.com/vault/docs/concepts/tokens#token-hierarchies-and-orphan-tokens