- A
Use AWS CloudTrail to monitor bucket creation and alert.
Why wrong: CloudTrail logs events but does not prevent noncompliant actions.
- B
Use AWS Config rules to detect and remediate noncompliant buckets.
Why wrong: Config rules can remediate but may have a delay; SCP provides preventive control.
- C
Apply a service control policy (SCP) that denies bucket creation without block public access.
SCPs can centrally enforce policies across all accounts.
- D
Create an IAM role in each account that restricts bucket permissions.
Why wrong: IAM roles do not automatically enforce settings across all buckets.
Question 1,004 of 1,705
ANS-C01 Network Security, Compliance and Governance Practice Question
This ANS-C01 practice question tests your understanding of network security, compliance and governance. 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.
A company uses AWS Organizations with multiple accounts. The security team needs to enforce that all S3 buckets in the organization have block public access enabled. Which approach should be used?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Apply a service control policy (SCP) that denies bucket creation without block public access.
Option C is correct because a service control policy (SCP) can deny the s3:PutBucketPublicAccessBlock action or enforce the block public access settings across all accounts in the organization. Option A (CloudTrail) is incorrect because CloudTrail only logs API calls for auditing, it does not enforce compliance. Option B (AWS Config) is incorrect because although AWS Config can detect noncompliant buckets, it requires additional automation for remediation and is not a direct enforcement mechanism like an SCP. Option D (IAM role) is incorrect because IAM roles grant permissions to principals and cannot enforce bucket-level settings across accounts; SCPs are the appropriate tool for organization-wide policy enforcement.
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 AWS CloudTrail to monitor bucket creation and alert.
Why it's wrong here
CloudTrail logs events but does not prevent noncompliant actions.
- ✗
Use AWS Config rules to detect and remediate noncompliant buckets.
Why it's wrong here
Config rules can remediate but may have a delay; SCP provides preventive control.
- ✓
Apply a service control policy (SCP) that denies bucket creation without block public access.
Why this is correct
SCPs can centrally enforce policies across all accounts.
Related concept
Standard ACLs match source addresses.
- ✗
Create an IAM role in each account that restricts bucket permissions.
Why it's wrong here
IAM roles do not automatically enforce settings across all buckets.
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.
Quick reference
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
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 ANS-C01 ACL questions on filtering logic and placement.
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FAQ
Questions learners often ask
What does this ANS-C01 question test?
Network Security, Compliance and Governance — This question tests Network Security, Compliance and Governance — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Apply a service control policy (SCP) that denies bucket creation without block public access. — Option C is correct because a service control policy (SCP) can deny the s3:PutBucketPublicAccessBlock action or enforce the block public access settings across all accounts in the organization. Option A (CloudTrail) is incorrect because CloudTrail only logs API calls for auditing, it does not enforce compliance. Option B (AWS Config) is incorrect because although AWS Config can detect noncompliant buckets, it requires additional automation for remediation and is not a direct enforcement mechanism like an SCP. Option D (IAM role) is incorrect because IAM roles grant permissions to principals and cannot enforce bucket-level settings across accounts; SCPs are the appropriate tool for organization-wide policy enforcement.
What should I do if I get this ANS-C01 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 ANS-C01 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Last reviewed: Jun 20, 2026
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