The answer is to enable default encryption on each S3 bucket, enforce encryption at upload via a bucket policy, and use AWS Config rules to detect non-compliant buckets. This three-pronged approach works because the bucket policy denies any PUT request that lacks the `x-amz-server-side-encryption` header, ensuring objects are encrypted on upload, while default encryption automatically encrypts new objects even if the upload request omits the header. AWS Config then continuously evaluates each bucket against a managed rule like `s3-bucket-server-side-encryption-enabled`, flagging any that fall out of compliance. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this scenario tests your understanding of defense-in-depth for S3 encryption, often appearing as a multi-select question where a distractor like enabling S3 server access logging is tempting but irrelevant. A common trap is thinking default encryption alone suffices—it does not prevent unencrypted uploads from succeeding if the request explicitly overrides the default. Memory tip: think "Policy + Default + Config" as the three pillars of enforced encryption.
DOP-C02 Security and Compliance Practice Question
This DOP-C02 practice question tests your understanding of security and compliance. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 DevOps team needs to enforce that all S3 buckets in an AWS account are encrypted at rest. Which THREE steps should be taken to achieve this? (Choose THREE.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure AWS Config rules to detect buckets without encryption
Using a bucket policy to deny PUT requests without encryption ensures objects are encrypted on upload. AWS Config rules can detect non-compliant buckets. S3 default encryption ensures new objects are encrypted. Option B is irrelevant; Option D is about logging.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Configure AWS Config rules to detect buckets without encryption
Why this is correct
Detects and can trigger remediation.
Related concept
Standard ACLs match source addresses.
✓
Use an S3 bucket policy to deny PutObject requests that do not include encryption headers
Why this is correct
Denies uploads without encryption.
Related concept
Standard ACLs match source addresses.
✗
Enable S3 server access logging
Why it's wrong here
Logging does not enforce encryption.
✓
Enable default encryption on each S3 bucket
Why this is correct
Ensures new objects are encrypted automatically.
Related concept
Standard ACLs match source addresses.
✗
Enable S3 Transfer Acceleration
Why it's wrong here
Transfer Acceleration is for speed, not encryption.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.
TExam Day Tips
→Check inbound versus outbound direction.
→Read the ACL from top to bottom.
→Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related DOP-C02 ACL questions on filtering logic and placement.
Security and Compliance — This question tests Security and Compliance — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Configure AWS Config rules to detect buckets without encryption — Using a bucket policy to deny PUT requests without encryption ensures objects are encrypted on upload. AWS Config rules can detect non-compliant buckets. S3 default encryption ensures new objects are encrypted. Option B is irrelevant; Option D is about logging.
What should I do if I get this DOP-C02 question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related DOP-C02 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Question Discussion
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