The answer is that the upload fails because the IAM policy condition requires the ACL to be bucket-owner-full-control, but the user did not specify any ACL during the upload. When no ACL is provided, Amazon S3 defaults to private, which does not satisfy the StringEquals condition, causing the policy to deny the action even though the s3:PutObject action and resource ARN are otherwise allowed. This scenario tests your understanding of how IAM policy conditions interact with S3 ACLs, a common challenge on the AWS Certified DevOps Engineer Professional DOP-C02 exam where cross-account uploads or bucket policies enforce ownership. A frequent trap is assuming a missing ACL defaults to bucket-owner-full-control or that the condition is evaluated only when an ACL is explicitly set. Remember the memory tip: "No ACL means private, so the condition fails—always specify bucket-owner-full-control when the policy demands it."
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 engineer created the IAM policy shown in the exhibit and attached it to a user. The user tries to upload an object to my-bucket without specifying the ACL. Why does the upload fail?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The policy condition requires the ACL to be bucket-owner-full-control, but the user did not specify it
The policy condition requires the ACL to be 'bucket-owner-full-control'. If the user does not specify an ACL, the default is usually 'private', which does not satisfy the condition. Therefore the action is denied. The resource ARN is correct. The action is allowed. The condition specifies StringEquals, which is correct for comparison.
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 Effect should be Deny for this policy to work
Why it's wrong here
Allow with condition works; Deny is not needed.
✗
The resource ARN is incorrect; it should be arn:aws:s3:::my-bucket
Why it's wrong here
The ARN with '/*' is correct for object operations.
✗
The user does not have permission to list the bucket
Why it's wrong here
The policy allows s3:PutObject, not list; the error is due to the ACL condition.
✓
The policy condition requires the ACL to be bucket-owner-full-control, but the user did not specify it
Why this is correct
The condition is not met, so the request is implicitly denied.
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.
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: The policy condition requires the ACL to be bucket-owner-full-control, but the user did not specify it — The policy condition requires the ACL to be 'bucket-owner-full-control'. If the user does not specify an ACL, the default is usually 'private', which does not satisfy the condition. Therefore the action is denied. The resource ARN is correct. The action is allowed. The condition specifies StringEquals, which is correct for comparison.
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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
This DOP-C02 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DOP-C02 exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.