- A
Apply a service control policy (SCP) to the root organizational unit that denies s3:PutBucketPublicAccessBlock and s3:PutBucketEncryption if the configuration does not meet requirements.
Correct: SCPs can deny non-compliant actions across accounts.
- B
Use an S3 bucket policy that denies all principals unless encryption is enabled.
Why wrong: Wrong: Bucket policies are per-bucket and not organization-wide.
- C
Create an AWS Config conformance pack with rules that check for encryption and public access, and auto-remediate non-compliant buckets.
Correct: Config rules can detect and remediate non-compliance.
- D
Enable AWS CloudTrail to monitor bucket creation and send alerts to the security team.
Why wrong: Wrong: CloudTrail only logs, not enforce.
- E
Create an IAM role in each account that requires MFA for creating S3 buckets.
Why wrong: Wrong: Does not enforce encryption or public access settings.
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 is designing a multi-account AWS environment using AWS Organizations. They need to enforce that all new S3 buckets created across accounts have encryption enabled and block public access. Which TWO approaches meet these requirements? (Choose two.)
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) to the root organizational unit that denies s3:PutBucketPublicAccessBlock and s3:PutBucketEncryption if the configuration does not meet requirements.
Option A is correct because SCPs can be applied to the root OU to deny s3:PutBucketPublicAccessBlock and s3:PutBucketEncryption unless the bucket meets encryption and public access requirements, thus enforcing the policy organization-wide. Option C is correct because AWS Config conformance packs can include managed rules to detect buckets without encryption or with public access, and automatic remediation actions can be configured to fix non-compliant buckets. Option B is incorrect because an S3 bucket policy only applies to a single bucket and cannot enforce requirements across all buckets in all accounts; it also cannot prevent creation of buckets that don't meet the policy. Option D is incorrect because CloudTrail only provides logging and alerting; it does not enforce or remediate. Option E is incorrect because an IAM role with MFA requirement does not enforce encryption or public access settings on buckets; it only controls who can create buckets.
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.
- ✓
Apply a service control policy (SCP) to the root organizational unit that denies s3:PutBucketPublicAccessBlock and s3:PutBucketEncryption if the configuration does not meet requirements.
Why this is correct
Correct: SCPs can deny non-compliant actions across accounts.
Related concept
Standard ACLs match source addresses.
- ✗
Use an S3 bucket policy that denies all principals unless encryption is enabled.
Why it's wrong here
Wrong: Bucket policies are per-bucket and not organization-wide.
- ✓
Create an AWS Config conformance pack with rules that check for encryption and public access, and auto-remediate non-compliant buckets.
Why this is correct
Correct: Config rules can detect and remediate non-compliance.
Related concept
Standard ACLs match source addresses.
- ✗
Enable AWS CloudTrail to monitor bucket creation and send alerts to the security team.
Why it's wrong here
Wrong: CloudTrail only logs, not enforce.
- ✗
Create an IAM role in each account that requires MFA for creating S3 buckets.
Why it's wrong here
Wrong: Does not enforce encryption or public access settings.
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) to the root organizational unit that denies s3:PutBucketPublicAccessBlock and s3:PutBucketEncryption if the configuration does not meet requirements. — Option A is correct because SCPs can be applied to the root OU to deny s3:PutBucketPublicAccessBlock and s3:PutBucketEncryption unless the bucket meets encryption and public access requirements, thus enforcing the policy organization-wide. Option C is correct because AWS Config conformance packs can include managed rules to detect buckets without encryption or with public access, and automatic remediation actions can be configured to fix non-compliant buckets. Option B is incorrect because an S3 bucket policy only applies to a single bucket and cannot enforce requirements across all buckets in all accounts; it also cannot prevent creation of buckets that don't meet the policy. Option D is incorrect because CloudTrail only provides logging and alerting; it does not enforce or remediate. Option E is incorrect because an IAM role with MFA requirement does not enforce encryption or public access settings on buckets; it only controls who can create buckets.
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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