CV0-004 Security Practice Question
A company uses AWS and needs to enforce that all S3 buckets are encrypted at rest with customer-managed keys stored in AWS KMS. Which IAM policy condition would ensure this?
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
✓
s3:x-amz-server-side-encryption-aws-kms-key-id
The 'aws:RequestTag' condition (or similar) can enforce that resources are created with specific tags, but to enforce encryption key usage, the condition 's3:x-amz-server-side-encryption-aws-kms-key-id' is used.
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:x-amz-server-side-encryption-aws-kms-key-id
Why this is correct
This condition allows requiring a specific KMS key ARN for encryption.
- ✗
s3:x-amz-server-side-encryption with value AES256
Why it's wrong here
AES256 refers to S3-managed keys, not customer-managed KMS keys.
- ✗
aws:SourceVpce
Why it's wrong here
This restricts requests to a specific VPC endpoint.
- ✗
s3:versioning
Why it's wrong here
Versioning is for object version management, not 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 CV0-004 practice question is part of Courseiva's free CompTIA 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 CV0-004 exam.