ANS-C01 Network Security, Compliance and Governance Practice Question
A company uses AWS Organizations with multiple accounts. The security team wants to centrally enforce that no Amazon S3 buckets are publicly accessible across all accounts. Which solution meets this requirement with the least operational overhead?
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) in AWS Organizations that denies the s3:PutBucketPublicAccessBlock action or enforces a bucket policy condition.
A service control policy (SCP) can be applied at the root organizational unit to deny the s3:PutBucketPublicAccessBlock action and enforce that no S3 buckets are publicly accessible across all accounts. Option A is incorrect because Trusted Advisor provides recommendations, not enforcement. Option C is incorrect because IAM roles are per-account and cannot centrally enforce across all accounts without additional overhead. Option D is incorrect because security groups apply to EC2 instances, not S3 buckets.
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 Trusted Advisor to check for public buckets and send alerts.
Why it's wrong here
Alerts are not enforcement.
- ✓
Apply a service control policy (SCP) in AWS Organizations that denies the s3:PutBucketPublicAccessBlock action or enforces a bucket policy condition.
Why this is correct
SCPs centrally enforce rules across all accounts.
- ✗
Create an IAM role in each account with a policy to deny public bucket access, and require users to assume that role.
Why it's wrong here
This is per-account, not centralized; users might not assume the role.
- ✗
Configure security group rules to block public internet access to the S3 endpoints.
Why it's wrong here
Security groups apply to EC2, not S3.
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 |
Go deeper
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This ANS-C01 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 ANS-C01 exam.