The upload fails because the bucket policy requires the x-amz-acl header to be set to bucket-owner-full-control. This occurs because the S3 bucket policy condition explicitly checks for the presence and value of the x-amz-acl header using a StringEquals condition; when the header is omitted entirely, the condition evaluates to false, and the request is denied by default. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this scenario tests your understanding of how bucket policy conditions interact with request headers, a common trap being that many candidates mistakenly think object ACLs or default permissions override a failing condition. The key insight is that bucket policies are evaluated before any object-level ACLs, so a missing required header triggers an immediate denial. Memory tip: think of the condition as a bouncer checking for a specific ID—if you don’t show it, you don’t get in.
DOP-C02 Resilient Cloud Solutions Practice Question
This DOP-C02 practice question tests your understanding of resilient cloud solutions. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
An AWS account owner (Account A) owns an S3 bucket named my-bucket. The bucket policy shown in the exhibit is attached to the bucket. A user from Account B attempts to upload an object to the bucket without specifying the x-amz-acl header. What will happen?
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 because the bucket policy requires the x-amz-acl header to be set to bucket-owner-full-control.
Option D is correct. The condition requires the x-amz-acl header to be set to bucket-owner-full-control. If the header is not specified, the condition fails, and the request is denied. Option A is wrong because the condition is not met. Option B is wrong because the policy does not grant permission without the header. Option C is wrong because the bucket policy evaluates before the object ACL.
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 fails because the bucket policy requires the object ACL to be set, but the default ACL allows the upload anyway.
Why it's wrong here
The condition is not satisfied, so the request is denied.
✗
The upload succeeds because the bucket policy does not explicitly deny the request.
Why it's wrong here
Implicit denial occurs when no statement allows the action.
✗
The upload succeeds because the bucket policy allows s3:PutObject for any principal.
Why it's wrong here
The condition is not met, so the statement does not apply.
✓
The upload fails because the bucket policy requires the x-amz-acl header to be set to bucket-owner-full-control.
Why this is correct
Without the header, the condition fails.
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 DOP-C02 ACL questions on filtering logic and placement.
Resilient Cloud Solutions — This question tests Resilient Cloud Solutions — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: The upload fails because the bucket policy requires the x-amz-acl header to be set to bucket-owner-full-control. — Option D is correct. The condition requires the x-amz-acl header to be set to bucket-owner-full-control. If the header is not specified, the condition fails, and the request is denied. Option A is wrong because the condition is not met. Option B is wrong because the policy does not grant permission without the header. Option C is wrong because the bucket policy evaluates before the object ACL.
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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