VA-003 Compare and configure secrets engines Practice Question
This VA-003 practice question tests your understanding of compare and configure secrets engines. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
An administrator enables the database secrets engine for PostgreSQL. After configuring the connection, running `vault write database/config/someconfig` yields error: 'x509: certificate signed by unknown authority'. 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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The PostgreSQL server's TLS certificate is not trusted by Vault's CA bundle
The error 'x509: certificate signed by unknown authority' indicates that Vault, when connecting to the PostgreSQL database, received a TLS certificate from the server that was not signed by any Certificate Authority (CA) present in Vault's trusted CA bundle. Vault uses its system's CA pool or a custom CA bundle configured in the connection string to verify the database server's certificate. If the PostgreSQL server uses a self-signed certificate or one issued by an internal CA not trusted by Vault, this error occurs. Option B correctly identifies that the PostgreSQL server's TLS certificate is not trusted by Vault's CA bundle.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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 connection string is incorrect
Why it's wrong here
An incorrect connection string would cause a connection timeout or refused, not a certificate error.
✓
The PostgreSQL server's TLS certificate is not trusted by Vault's CA bundle
Why this is correct
Vault must trust the database server's certificate; otherwise x509 error occurs.
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.
✗
The database engine is not enabled
Why it's wrong here
If not enabled, the write would fail with 'no secrets engine mounted at path'.
✗
The Vault server's TLS certificate is self-signed
Why it's wrong here
That would affect client-to-Vault TLS, not Vault-to-database TLS.
Common exam traps
Common exam trap: answer the scenario, not the keyword
HashiCorp often tests the distinction between TLS errors related to the target server's certificate (outbound connection) versus the Vault server's own certificate (inbound connection), causing candidates to confuse the direction of the TLS handshake.
Detailed technical explanation
How to think about this question
When Vault connects to PostgreSQL, it performs TLS handshake verification using the system's CA trust store or a custom `tls_ca` parameter in the connection string. If the PostgreSQL server presents a certificate signed by an internal CA, that CA's certificate must be added to Vault's trust store or specified in the `tls_ca` field. A common real-world scenario is using a self-signed certificate on the PostgreSQL server for internal lab environments, which requires explicitly configuring Vault to trust that certificate or disabling TLS verification (not recommended).
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the VA-003 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Compare and configure secrets engines — This question tests Compare and configure secrets engines — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The PostgreSQL server's TLS certificate is not trusted by Vault's CA bundle — The error 'x509: certificate signed by unknown authority' indicates that Vault, when connecting to the PostgreSQL database, received a TLS certificate from the server that was not signed by any Certificate Authority (CA) present in Vault's trusted CA bundle. Vault uses its system's CA pool or a custom CA bundle configured in the connection string to verify the database server's certificate. If the PostgreSQL server uses a self-signed certificate or one issued by an internal CA not trusted by Vault, this error occurs. Option B correctly identifies that the PostgreSQL server's TLS certificate is not trusted by Vault's CA bundle.
What should I do if I get this VA-003 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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