DEA-C01 Data Security and Governance Practice Question
A company is using Amazon S3 to store log files. The security team requires that all data be encrypted in transit. Which of the following ensures encryption in transit for S3?
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
✓
Use HTTPS (SSL/TLS) when accessing S3 endpoints.
Encryption in transit for S3 is achieved by using HTTPS (SSL/TLS) when accessing S3 endpoints (option A). Option B (Transfer Acceleration) speeds up uploads but does not provide encryption in transit by itself. Option C (client-side encryption) protects data at rest and during transit only if combined with HTTPS. Option D (SSE-S3) is at-rest encryption. Therefore, the correct answer is A.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Use HTTPS (SSL/TLS) when accessing S3 endpoints.
Why this is correct
HTTPS encrypts data in transit between client and S3.
- ✗
Use Amazon S3 Transfer Acceleration.
Why it's wrong here
Transfer Acceleration speeds up transfers over long distances but does not inherently encrypt data in transit; HTTPS is still needed.
- ✗
Enable client-side encryption before uploading to S3.
Why it's wrong here
Client-side encryption encrypts data before upload, but transmission may still be unencrypted unless HTTPS is used.
- ✗
Use server-side encryption with S3 managed keys (SSE-S3).
Why it's wrong here
SSE-S3 encrypts data at rest, not in transit.
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.