DEA-C01 Data Security and Governance Practice Question
A company uses AWS Glue to process sensitive customer data stored in S3. The security team requires that all data be encrypted at rest using a customer-managed KMS key and that access to the key be auditable. Which solution meets these requirements?
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
✓
Configure the S3 bucket to use SSE-KMS with a customer-managed KMS key and enable CloudTrail for KMS events.
SSE-KMS with a customer-managed KMS key provides encryption at rest and, when combined with CloudTrail logging for KMS events, offers full auditability of key usage. Option A (client-side encryption) does not encrypt data at rest within S3; it encrypts before upload. Option C (SSE-S3) uses AWS-managed keys, which do not allow customer audit of key access. Option D (SSE-C) relies on customer-provided keys that are not managed by KMS and cannot be audited via CloudTrail.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Encrypt the data client-side before uploading to S3.
Why it's wrong here
Client-side encryption is not at-rest encryption managed by S3.
- ✓
Configure the S3 bucket to use SSE-KMS with a customer-managed KMS key and enable CloudTrail for KMS events.
Why this is correct
SSE-KMS with customer-managed key provides encryption and auditability via CloudTrail.
- ✗
Enable default SSE-S3 encryption on the S3 bucket.
Why it's wrong here
SSE-S3 uses AWS-managed keys, not customer-managed.
- ✗
Use SSE-C with a customer-provided key.
Why it's wrong here
SSE-C does not use KMS and does not provide audit logging of key usage.
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 |
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This DEA-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 DEA-C01 exam.