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 security audit reveals that an S3 bucket contains objects that are publicly accessible. The DevOps engineer must prevent any future public access to the bucket and all objects within it. Which THREE actions should the engineer take? (Choose THREE.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable Block Public Access settings on the bucket.
Option A is correct because blocking public access at the bucket level prevents future public access. Option B is correct because using an SCP can enforce no public access for all accounts. Option C is correct because removing the bucket policy that grants public access is necessary. Option D is wrong because ACLs are not the only method; bucket policy can also grant public access. Option E is wrong because enabling server access logging does not affect public access.
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.
✓
Enable Block Public Access settings on the bucket.
Why this is correct
Prevents any future public access at bucket level.
Related concept
Standard ACLs match source addresses.
✗
Disable object ACLs on the bucket.
Why it's wrong here
ACLs are not the only way to grant public access.
✓
Remove any bucket policy that grants public read access.
Why this is correct
Directly removes the permission.
Related concept
Standard ACLs match source addresses.
✓
Apply an SCP that denies s3:PutBucketPolicy that would make objects public.
Why this is correct
Enforces no public access organization-wide.
Related concept
Standard ACLs match source addresses.
✗
Enable S3 server access logging.
Why it's wrong here
Logging does not prevent public access.
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: Enable Block Public Access settings on the bucket. — Option A is correct because blocking public access at the bucket level prevents future public access. Option B is correct because using an SCP can enforce no public access for all accounts. Option C is correct because removing the bucket policy that grants public access is necessary. Option D is wrong because ACLs are not the only method; bucket policy can also grant public access. Option E is wrong because enabling server access logging does not affect public access.
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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