The upload fails with an Access Denied error because the S3 bucket policy enforces SSE-S3 encryption on upload by denying any PutObject request that does not include the x-amz-server-side-encryption header set to AES256. When the IAM user omits the encryption header, the condition in the Deny statement—StringNotEquals s3:x-amz-server-side-encryption AES256—evaluates to true, triggering the explicit Deny which overrides any Allow in the policy. This scenario is a classic exam trap on the AWS Certified Data Engineer Associate DEA-C01, testing your understanding of how S3 bucket policies evaluate explicit Deny before Allow, and how encryption enforcement is implemented via conditional statements. A common mistake is assuming the Allow would grant access, but remember: an explicit Deny always wins. For your memory tip, think “No header, no entry—Deny beats Allow every time.”
DEA-C01 Data Security and Governance Practice Question
This DEA-C01 practice question tests your understanding of data security and governance. 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.
Refer to the exhibit. The S3 bucket policy above is applied to the bucket "example-bucket". An IAM user attempts to upload an object to the bucket without specifying any encryption header. What is the outcome?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The upload fails with an Access Denied error
Option B is correct because the Deny statement denies PutObject if the encryption header is not AES256. Since the user did not specify encryption, the condition StringNotEquals evaluates to true, and the request is denied. Option A is wrong because the Deny overrides the Allow. Option C is wrong because the Deny is specific. Option D is wrong because the bucket policy does not require encryption for GetObject.
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.
✗
The upload succeeds but the object is not encrypted
Why it's wrong here
Deny overrides allow.
✗
The upload fails because GetObject requires encryption
Why it's wrong here
GetObject is not being performed.
✗
The object is uploaded successfully with SSE-S3 encryption by default
Why it's wrong here
The Deny denies the request.
✓
The upload fails with an Access Denied error
Why this is correct
The Deny statement blocks the upload.
Related concept
Standard ACLs match source addresses.
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 DEA-C01 ACL questions on filtering logic and placement.
Data Security and Governance — This question tests Data Security and Governance — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: The upload fails with an Access Denied error — Option B is correct because the Deny statement denies PutObject if the encryption header is not AES256. Since the user did not specify encryption, the condition StringNotEquals evaluates to true, and the request is denied. Option A is wrong because the Deny overrides the Allow. Option C is wrong because the Deny is specific. Option D is wrong because the bucket policy does not require encryption for GetObject.
What should I do if I get this DEA-C01 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 DEA-C01 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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