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.
A multi-national company uses Vault's AWS secrets engine to manage access to multiple AWS accounts. They have a central Vault cluster and need to generate IAM users in account A that assume a role in account B for cross-account access. The team has configured the AWS secrets engine with the root credentials of account A. They created a role on the engine that should generate STS credentials for the cross-account role. However, when they try to generate credentials, Vault returns an error: 'AccessDenied: User: arn:aws:iam::<accountA>:user/vault-user is not authorized to perform: STS:AssumeRole on resource: arn:aws:iam::<accountB>:role/CrossAccountRole'. What additional configuration is required?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Attach an IAM policy to the Vault user in account A that allows sts:AssumeRole on the cross-account role ARN.
The error indicates that the Vault user in account A lacks the IAM permission to call sts:AssumeRole on the cross-account role in account B. Even though the AWS secrets engine is configured with root credentials of account A, the engine uses those credentials to make API calls on behalf of the Vault user. Therefore, you must attach an IAM policy to the Vault user in account A that explicitly allows sts:AssumeRole on the target role ARN in account B. This is a prerequisite for cross-account access via STS.
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.
✗
Create a new role in the AWS secrets engine that uses the cross-account role ARN directly.
Why it's wrong here
The role configuration in Vault defines which role to assume, but the underlying IAM user still needs permissions.
✗
Change the AWS secrets engine mount path to avoid conflicts.
Why it's wrong here
Mount path is irrelevant to IAM permissions.
✗
Set up AWS federation with SAML to allow cross-account access.
Why it's wrong here
Federation is a different mechanism; the secrets engine uses IAM users/roles, not SAML.
✓
Attach an IAM policy to the Vault user in account A that allows sts:AssumeRole on the cross-account role ARN.
Why this is correct
The Vault user needs explicit permission to assume the target role.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
HashiCorp often tests the misconception that configuring the AWS secrets engine role with the cross-account role ARN is sufficient, when in fact the underlying IAM permissions for the Vault user must also be explicitly granted.
Detailed technical explanation
How to think about this question
Under the hood, the AWS secrets engine uses the configured AWS credentials (root or IAM) to call the STS AssumeRole API. The Vault user in account A must have an IAM policy that grants sts:AssumeRole on the target role ARN in account B, and the target role in account B must have a trust policy that allows the Vault user's ARN (or account A) to assume it. A common real-world scenario is when the Vault user is created with only programmatic access and no inline policies, leading to this exact AccessDenied error.
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 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
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: Attach an IAM policy to the Vault user in account A that allows sts:AssumeRole on the cross-account role ARN. — The error indicates that the Vault user in account A lacks the IAM permission to call sts:AssumeRole on the cross-account role in account B. Even though the AWS secrets engine is configured with root credentials of account A, the engine uses those credentials to make API calls on behalf of the Vault user. Therefore, you must attach an IAM policy to the Vault user in account A that explicitly allows sts:AssumeRole on the target role ARN in account B. This is a prerequisite for cross-account access via STS.
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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