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DVA-C02 Security Practice Question

This DVA-C02 practice question tests your understanding of security. 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 developer in Account A has an Amazon S3 bucket that contains sensitive data. The developer wants to grant an IAM user in Account B read-only access to objects in the bucket. The developer has added a bucket policy in Account A that grants s3:GetObject access to the IAM user's ARN. However, the IAM user in Account B still receives Access Denied errors. What additional configuration is required?

Question 1easymultiple choice

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A
Add an IAM policy in Account B that allows the user to perform s3:GetObject on the bucket's ARN.
The IAM user must have explicit permission via an IAM policy to access the S3 bucket. The bucket policy alone is not sufficient; the user's account must also allow the action.
B
Create an S3 access point and grant the user access through it.
Why wrong: S3 access points are not required for this scenario. They provide a simplified way to manage access but would not resolve the missing IAM policy issue.
C
Change the bucket policy to grant access to the entire AWS account B instead of the specific user.
Why wrong: Granting access to the entire account could violate least privilege and still does not address the need for the user to have an IAM policy allowing the action.
D
Enable S3 object ownership and set the bucket ACL to grant read access to the user in Account B.
Why wrong: S3 ACLs are legacy and not recommended. They also require the object owner to grant access, and the bucket policy is already in place. The missing piece is the IAM policy in the user's account.

Full breakdown with real-world context →

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

✓

Add an IAM policy in Account B that allows the user to perform s3:GetObject on the bucket's ARN.

Option A is correct because cross-account access to S3 requires both a bucket policy in the source account (Account A) granting the necessary permissions to the target IAM user, and an IAM identity-based policy in the target account (Account B) that explicitly allows the same action (s3:GetObject) on the bucket's ARN. Without the IAM policy in Account B, the user lacks the authorization to initiate the request, even though the bucket policy permits it. This dual-permission model is a fundamental security requirement for cross-account S3 access.

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.

✓
Add an IAM policy in Account B that allows the user to perform s3:GetObject on the bucket's ARN.
Why this is correct
The IAM user must have explicit permission via an IAM policy to access the S3 bucket. The bucket policy alone is not sufficient; the user's account must also allow the action.
Related concept
Read the scenario before looking for a memorised answer.
✗
Create an S3 access point and grant the user access through it.
Why it's wrong here
S3 access points are not required for this scenario. They provide a simplified way to manage access but would not resolve the missing IAM policy issue.
✗
Change the bucket policy to grant access to the entire AWS account B instead of the specific user.
Why it's wrong here
Granting access to the entire account could violate least privilege and still does not address the need for the user to have an IAM policy allowing the action.
✗
Enable S3 object ownership and set the bucket ACL to grant read access to the user in Account B.
Why it's wrong here
S3 ACLs are legacy and not recommended. They also require the object owner to grant access, and the bucket policy is already in place. The missing piece is the IAM policy in the user's account.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates often assume a bucket policy alone is sufficient for cross-account access, overlooking the mandatory IAM policy in the target account that must explicitly allow the action.

Trap categories for this question

Scenario analysis trap
S3 access points are not required for this scenario. They provide a simplified way to manage access but would not resolve the missing IAM policy issue.

Detailed technical explanation

How to think about this question

Under the hood, AWS evaluates both the resource-based policy (bucket policy in Account A) and the identity-based policy (IAM policy in Account B) for cross-account requests; if either policy denies the action, the request fails. This is enforced by the AWS IAM policy evaluation logic, which requires an explicit allow from both sides unless the request originates from the same account. A real-world scenario where this matters is when a developer grants cross-account access but forgets to attach the IAM policy, leading to Access Denied errors that can be resolved by adding the appropriate IAM statement.

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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.

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.

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FAQ

Questions learners often ask

What does this DVA-C02 question test?

Security — This question tests Security — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: Add an IAM policy in Account B that allows the user to perform s3:GetObject on the bucket's ARN. — Option A is correct because cross-account access to S3 requires both a bucket policy in the source account (Account A) granting the necessary permissions to the target IAM user, and an IAM identity-based policy in the target account (Account B) that explicitly allows the same action (s3:GetObject) on the bucket's ARN. Without the IAM policy in Account B, the user lacks the authorization to initiate the request, even though the bucket policy permits it. This dual-permission model is a fundamental security requirement for cross-account S3 access.

What should I do if I get this DVA-C02 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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