The answer is the condition requiring bucket-owner-full-control ACL, but the bucket policy in Account B may not allow it. This is the most likely cause of failure because the IAM policy in Account A explicitly restricts the PutObject action to only succeed when the ACL condition is set to bucket-owner-full-control. If the destination bucket policy in Account B does not accept objects with that ACL—for instance, if it requires a different ACL or denies the bucket-owner-full-control setting—the upload will be rejected, even though the IAM permissions are correctly scoped. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this scenario tests your understanding of cross-account S3 uploads and the interplay between IAM policies and bucket policies, specifically how ACL conditions can silently block transfers. A common trap is assuming the IAM policy alone is sufficient, but the bucket policy must also permit the requested ACL. Memory tip: think “IAM allows, bucket accepts”—both must agree on the ACL for the upload to succeed.
DOP-C02 SDLC Automation Practice Question
This DOP-C02 practice question tests your understanding of sdlc automation. 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.
Refer to the exhibit. A DevOps engineer is troubleshooting a cross-account deployment where an AWS CodeBuild project in Account A needs to upload build artifacts to an S3 bucket in Account B. The engineer attaches this IAM policy to the CodeBuild service role in Account A. However, the upload fails. What is the most likely reason?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The condition requires bucket-owner-full-control ACL, but the bucket policy may not allow it
Option C is correct because the policy only allows PutObject with the condition that the ACL is 'bucket-owner-full-control'. If the bucket policy in Account B does not accept objects with that ACL, the upload might fail. Option A is incorrect because the action is PutObject. Option B is incorrect because GetObject is not needed for upload. Option D is incorrect because the bucket policy is not shown.
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 bucket policy in Account B grants s3:PutObject to Account A
Why it's wrong here
That would help, but the issue is the condition.
✓
The condition requires bucket-owner-full-control ACL, but the bucket policy may not allow it
Why this is correct
Cross-account uploads often require bucket policy to grant permissions.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Standard ACLs match source addresses.
✗
The policy does not include s3:PutObjectAcl permission
Why it's wrong here
PutObjectAcl is not required for upload.
✗
The policy does not include s3:GetObject permission
Why it's wrong here
GetObject is not needed for upload.
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.
SDLC Automation — This question tests SDLC Automation — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: The condition requires bucket-owner-full-control ACL, but the bucket policy may not allow it — Option C is correct because the policy only allows PutObject with the condition that the ACL is 'bucket-owner-full-control'. If the bucket policy in Account B does not accept objects with that ACL, the upload might fail. Option A is incorrect because the action is PutObject. Option B is incorrect because GetObject is not needed for upload. Option D is incorrect because the bucket policy is not shown.
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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Standard ACLs match source addresses.
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