ANS-C01 Network Security, Compliance and Governance Practice Question
A company has a multi-account AWS environment using AWS Organizations. They need to enforce that all newly created S3 buckets are encrypted with SSE-KMS using a specific KMS key. Which policy should they use?
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
✓
SCP in AWS Organizations
A Service Control Policy (SCP) in AWS Organizations can be attached to the root or an OU to deny the creation of S3 buckets that do not use a specific KMS key for encryption. This is a preventive control that applies across all accounts in the organization. Option A (S3 bucket policy) is incorrect because bucket policies are applied at the bucket level after creation and cannot prevent the creation of the bucket. Option B (IAM policy) is incorrect because IAM policies are per-account and cannot be enforced centrally across all accounts. Option C (AWS Config rule with auto-remediation) is incorrect because Config rules are detective and can only trigger remediation after a non-compliant bucket is created, not prevent the creation.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
S3 bucket policy on each bucket
Why it's wrong here
Bucket policies apply after bucket creation, cannot prevent creation.
- ✗
IAM policy in each account
Why it's wrong here
IAM policies are account-specific and not centrally enforced across all accounts.
- ✗
AWS Config rule with auto-remediation
Why it's wrong here
Config rules detect but do not prevent creation; they can auto-remediate after the fact.
- ✓
SCP in AWS Organizations
Why this is correct
SCPs can centrally deny actions across accounts, such as creating buckets without encryption.
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.