DBS-C01 Database Security Practice Question
A company uses Amazon DynamoDB with AWS KMS customer managed keys for encryption at rest. The security team wants to audit who is using the KMS key to encrypt and decrypt data. Which AWS service should be used?
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
✓
AWS CloudTrail
AWS CloudTrail logs all KMS API calls, including Encrypt and Decrypt, enabling auditing of who used the KMS key. Amazon S3 access logs (option A) are for S3 bucket access, not KMS. AWS Config (option B) tracks resource configuration changes, not API calls. Amazon CloudWatch Logs (option D) can store logs but does not capture KMS API calls by itself.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Amazon S3 access logs
Why it's wrong here
Amazon S3 access logs are for S3 bucket access, not KMS API calls.
- ✗
AWS Config
Why it's wrong here
AWS Config tracks resource configuration changes, not API calls.
- ✓
AWS CloudTrail
Why this is correct
AWS CloudTrail logs all KMS API calls, including Encrypt and Decrypt, enabling auditing of who used the KMS key.
- ✗
Amazon CloudWatch Logs
Why it's wrong here
Amazon CloudWatch Logs can store logs but does not capture KMS API calls by itself.
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 DBS-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 DBS-C01 exam.