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Question 247 of 1,616

Security →mediumMultiple ChoiceObjective-mapped

Quick Answer

The correct answer is to enable S3 Block Public Access at the bucket level. This feature provides a definitive, irreversible override that prevents any public access to the bucket, even if a bucket policy or ACL is incorrectly set to allow public access. It works by intercepting and denying all public requests at the S3 service level, before any policy evaluation occurs, making it a critical safety net for confidential data. On the AWS Certified Developer Associate DVA-C02 exam, this question tests your understanding of defense-in-depth and the hierarchy of S3 security controls—specifically that Block Public Access supersedes both bucket policies and ACLs. A common trap is confusing this with disabling ACLs or relying solely on a restrictive bucket policy; remember that only Block Public Access provides a hard guarantee against public exposure. Memory tip: think of it as a master kill switch for public access—once enabled, no policy or ACL can override it.

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 company has an S3 bucket containing confidential data. The security team wants to ensure that the bucket is never publicly accessible, even if a bucket policy or ACL is incorrectly set to allow public access. Which S3 feature should the developer enable?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "never"
Why it matters: Absolute qualifier. True only if the statement has zero exceptions — be cautious of options that seem obvious but break down in edge cases.

Question 1mediummultiple choice

Study the full ACL explanation →

A
Enable S3 Transfer Acceleration to ensure faster uploads.
Why wrong: Transfer Acceleration is used to speed up uploads over long distances, not to control public access. It does not affect bucket permissions.
B
Enable S3 Block Public Access (bucket-level).
S3 Block Public Access provides an additional layer of security that prevents any public access, even if a bucket policy or ACL inadvertently allows it. It is the recommended way to ensure a bucket is never public.
C
Enable S3 Server Access Logging to monitor access.
Why wrong: Server Access Logging provides detailed access logs but does not block public access. It is a monitoring tool, not a preventive control.
D
Enable S3 Object Lock to prevent objects from being deleted.
Why wrong: Object Lock helps prevent objects from being deleted or overwritten for a specified period. It does not address public access concerns.

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

✓

Enable S3 Block Public Access (bucket-level).

Option B is correct because S3 Block Public Access (bucket-level) provides a definitive override that prevents any public access to the bucket, regardless of any bucket policies or ACLs that might otherwise grant public access. This feature acts as a safety net, ensuring that even if a policy or ACL is misconfigured to allow public access, the block public access settings will deny all public requests at the S3 service level before any policy evaluation occurs.

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.

✗
Enable S3 Transfer Acceleration to ensure faster uploads.
Why it's wrong here
Transfer Acceleration is used to speed up uploads over long distances, not to control public access. It does not affect bucket permissions.
✓
Enable S3 Block Public Access (bucket-level).
Why this is correct
S3 Block Public Access provides an additional layer of security that prevents any public access, even if a bucket policy or ACL inadvertently allows it. It is the recommended way to ensure a bucket is never public.
Clue confirmation
The clue word "never" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Enable S3 Server Access Logging to monitor access.
Why it's wrong here
Server Access Logging provides detailed access logs but does not block public access. It is a monitoring tool, not a preventive control.
✗
Enable S3 Object Lock to prevent objects from being deleted.
Why it's wrong here
Object Lock helps prevent objects from being deleted or overwritten for a specified period. It does not address public access concerns.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates often confuse monitoring features (like logging) or object protection features (like Object Lock) with access control mechanisms, failing to recognize that S3 Block Public Access is the only feature specifically designed to enforce a hard block on public access regardless of other configurations.

Detailed technical explanation

How to think about this question

S3 Block Public Access settings are evaluated at the S3 service API layer before any bucket policy or ACL evaluation, meaning they can deny requests that would otherwise be allowed by a permissive policy. These settings can be applied at the account level (via AWS Organizations or SCPs) or at the individual bucket level, and they override any explicit public grants in bucket policies or ACLs. For example, even if a bucket policy grants s3:GetObject to 'Principal': '*', enabling 'BlockPublicPolicy' will cause S3 to reject that policy update, preventing the bucket from ever becoming public.

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: Enable S3 Block Public Access (bucket-level). — Option B is correct because S3 Block Public Access (bucket-level) provides a definitive override that prevents any public access to the bucket, regardless of any bucket policies or ACLs that might otherwise grant public access. This feature acts as a safety net, ensuring that even if a policy or ACL is misconfigured to allow public access, the block public access settings will deny all public requests at the S3 service level before any policy evaluation occurs.

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.

Are there clue words in this question I should notice?

Yes — watch for: "never". Absolute qualifier. True only if the statement has zero exceptions — be cautious of options that seem obvious but break down in edge cases.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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This DVA-C02 practice question is part of Courseiva's free Amazon Web Services 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 DVA-C02 exam.