VA-003 Compare authentication methods Practice Question
A company uses OIDC auth for human users. After the OIDC provider rotates its signing keys, some users report that they cannot authenticate. The Vault logs show that the OIDC response validation fails. What is the most likely cause?
⚠ Common exam trap
HashiCorp often tests the distinction between token expiration (which is a time-based claim validation) and key rotation (which is a cryptographic signature validation failure), leading candidates to incorrectly choose the expired token option when the real issue is stale cached keys.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Vault's OIDC cache has old JWKS keys
When an OIDC provider rotates its signing keys, Vault must fetch the new JWKS (JSON Web Key Set) to validate the token signature. Vault caches the JWKS for performance, and if the cache still holds the old keys, signature validation fails for tokens signed with the new key. This matches the symptom of OIDC response validation failing immediately after a key rotation.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The OIDC role is misconfigured
Why it's wrong here
Role configuration likely unchanged.
- ✗
The client's OIDC token is expired
Why it's wrong here
Token expiry is unrelated to validation failure.
- ✗
The OIDC provider is down
Why it's wrong here
The provider is reachable but signing keys changed.
- ✓
Vault's OIDC cache has old JWKS keys
Why this is correct
Vault's cached JWKS may be outdated after key rotation.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This VA-003 practice question is part of Courseiva's free HashiCorp certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the VA-003 exam.