This DOP-C02 practice question tests your understanding of security and compliance. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 company uses AWS Organizations with multiple accounts. The security team wants to enforce that all new S3 buckets created in any account within the organization are configured with block public access enabled. Which approach is the most scalable and least operationally burdensome?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "least"
Why it matters: You want the option with minimum overhead, fewest steps, or lowest impact — not the most feature-rich or comprehensive answer.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Attach an SCP to the organization root that denies s3:CreateBucket unless the request includes 's3:PutBucketPublicAccessBlock'.
Option C is correct because a service control policy (SCP) can deny the creation of S3 buckets without the 'BlockPublicAccess' settings. This applies to all accounts in the organization. Option A is wrong because AWS Config is reactive, not preventive. Option B is wrong because it requires configuring each account individually. Option D is wrong because CloudTrail is for auditing, not prevention.
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.
✗
Use an AWS Config managed rule to detect non-compliant buckets and trigger a remediation Lambda function.
Why it's wrong here
Reactive, not preventive.
✗
Enable AWS CloudTrail and create a metric filter to alert on bucket creation, then manually review.
Why it's wrong here
Manual and reactive.
✗
Apply an S3 bucket policy in each account that denies s3:PutBucketPublicAccessBlock with a condition.
Why it's wrong here
Requires per-account configuration.
✓
Attach an SCP to the organization root that denies s3:CreateBucket unless the request includes 's3:PutBucketPublicAccessBlock'.
Why this is correct
Preventive and scalable.
Clue confirmation
The clue word "least" in the question point toward this answer.
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: Attach an SCP to the organization root that denies s3:CreateBucket unless the request includes 's3:PutBucketPublicAccessBlock'. — Option C is correct because a service control policy (SCP) can deny the creation of S3 buckets without the 'BlockPublicAccess' settings. This applies to all accounts in the organization. Option A is wrong because AWS Config is reactive, not preventive. Option B is wrong because it requires configuring each account individually. Option D is wrong because CloudTrail is for auditing, not prevention.
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: "least". You want the option with minimum overhead, fewest steps, or lowest impact — not the most feature-rich or comprehensive answer.
What is the key concept behind this question?
Standard ACLs match source addresses.
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