The answer is S3 Block Public Access at the account level. This feature is the correct choice because it provides a centralized override that prevents any S3 bucket in the account from becoming publicly accessible, even if a bucket policy or ACL is later configured to allow public access. When enabled at the account level, these settings apply to all current and future buckets, effectively blocking any public access grants regardless of subsequent configuration changes. On the AWS Certified Developer Associate DVA-C02 exam, this question tests your understanding of how S3 Block Public Access acts as a security guardrail that takes precedence over bucket-level permissions—a common trap is confusing it with bucket policies or ACLs alone, which can still be overridden. Remember that account-level enforcement is the only way to guarantee no bucket can ever be made public, making it a critical security control for compliance. Memory tip: think of it as a master kill switch for public access—once flipped at the account level, no bucket 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 wants to ensure that no Amazon S3 buckets in the AWS account can be made publicly accessible, even if a bucket policy or ACL is later configured to allow public access. Which AWS feature should the developer enable to enforce this at the account level?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
S3 Block Public Access
S3 Block Public Access is the correct choice because it provides account-level settings that override any bucket-level policies or ACLs that would grant public access. When enabled at the account level, these settings apply to all current and future S3 buckets, effectively preventing any bucket from becoming publicly accessible regardless of subsequent configuration changes.
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.
✓
S3 Block Public Access
Why this is correct
Correct. S3 Block Public Access at the account level prevents any public access to buckets regardless of bucket policies or ACLs.
Related concept
Read the scenario before looking for a memorised answer.
✗
S3 Object Lock
Why it's wrong here
Incorrect. S3 Object Lock is used to prevent objects from being deleted or overwritten for a fixed time, not to block public access.
✗
S3 Transfer Acceleration
Why it's wrong here
Incorrect. S3 Transfer Acceleration speeds up uploads over long distances, it does not control public access.
✗
S3 Bucket Policy with Deny clause
Why it's wrong here
Incorrect. A bucket policy is evaluated per bucket and can be overwritten or misconfigured. It does not provide account-level enforcement.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often choose a bucket policy with a Deny clause (Option D) thinking it can enforce account-wide restrictions, but they overlook that such policies are bucket-specific and can be removed or modified by users with appropriate IAM permissions, whereas S3 Block Public Access provides a centralized, immutable account-level control.
Detailed technical explanation
How to think about this question
S3 Block Public Access consists of four settings: BlockPublicAcls, IgnorePublicAcls, BlockPublicPolicy, and RestrictPublicBuckets. When enabled at the account level via the PutAccountPublicAccessBlock API, these settings are stored as a public access block configuration that is evaluated before any bucket policy or ACL, effectively creating a hard barrier that cannot be bypassed by bucket-level changes. This is particularly important in multi-account or CI/CD environments where a misconfigured bucket policy could inadvertently expose data.
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.
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: S3 Block Public Access — S3 Block Public Access is the correct choice because it provides account-level settings that override any bucket-level policies or ACLs that would grant public access. When enabled at the account level, these settings apply to all current and future S3 buckets, effectively preventing any bucket from becoming publicly accessible regardless of subsequent configuration changes.
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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Question Discussion
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