DEA-C01 Data Security and Governance Practice Question
A company needs to enforce encryption in transit for all data moving between its Amazon S3 bucket and a fleet of Amazon EC2 instances. The data is accessed via S3 API calls over the internet. Which configuration ensures encryption in transit?
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 bucket policy to deny requests that do not use HTTPS.
Configuring the bucket policy to deny requests that do not use HTTPS ensures encryption in transit for S3 API calls. Option A is wrong because SSE-S3 encrypts data at rest, not in transit. Option B is wrong because S3 Transfer Acceleration uses a global network but does not enforce encryption; HTTPS must still be used. Option C is wrong because a VPC endpoint for S3 uses AWS network but does not enforce encryption; the bucket policy must explicitly require HTTPS.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Enable SSE-S3 on the bucket.
Why it's wrong here
SSE-S3 encrypts data at rest, not in transit.
- ✗
Enable S3 Transfer Acceleration.
Why it's wrong here
Transfer Acceleration speeds up uploads, does not enforce encryption.
- ✗
Use a VPC endpoint for S3.
Why it's wrong here
VPC endpoint does not enforce encryption; HTTPS still needed.
- ✓
Configure the bucket policy to deny requests that do not use HTTPS.
Why this is correct
Bucket policy with condition aws:SecureTransport true enforces HTTPS.
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 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.