This VA-003 practice question tests your understanding of compare authentication methods. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
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?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
The OIDC role is misconfigured
Why wrong: Role configuration likely unchanged.
The client's OIDC token is expired
Why wrong: Token expiry is unrelated to validation failure.
The OIDC provider is down
Why wrong: The provider is reachable but signing keys changed.
Vault's OIDC cache has old JWKS keys
Vault's cached JWKS may be outdated after key rotation.
Answer choices
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.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
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.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
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.
Detailed technical explanation
Vault's OIDC authentication uses the `jwks_url` from the provider's OpenID Connect discovery document to fetch public keys. By default, Vault caches the JWKS for 10 minutes (configurable via `oidc_discovery_max_age`). After a key rotation, the provider signs new tokens with the new private key, but Vault continues to validate against the cached old public key until the cache expires or is manually refreshed via `vault write identity/oidc/key/<name>` or by restarting Vault. This is a common operational pitfall in environments where key rotation policies are aggressive.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
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FAQ
Compare authentication methods — This question tests Compare authentication methods — Read the scenario before looking for a memorised answer..
The correct answer is: 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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 2026
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