DEA-C01 Data Security and Governance Practice Question
A data engineer is designing a data pipeline that ingests data from an on-premises system into Amazon S3 using AWS Transfer Family. The data must be encrypted at rest using a customer-managed key in AWS KMS. The S3 bucket policy must allow only encrypted connections. Which policy condition 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:SecureTransport
The condition aws:SecureTransport is used to enforce that connections to S3 are encrypted in transit using TLS/HTTPS. This ensures data is encrypted during transmission. Option B is incorrect because kms:EncryptionContext is used to add encryption context to KMS operations, not to enforce encrypted connections. Option C is incorrect because s3:x-amz-server-side-encryption-aws-kms-key-id enforces the use of a specific KMS key for server-side encryption, not in-transit encryption. Option D is incorrect because s3:x-amz-server-side-encryption enforces server-side encryption (SSE) for objects at rest, not in-transit encryption.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
aws:SecureTransport
Why this is correct
This condition enforces that connections use TLS.
- ✗
kms:EncryptionContext
Why it's wrong here
This is for KMS encryption context, not for in-transit encryption.
- ✗
s3:x-amz-server-side-encryption-aws-kms-key-id
Why it's wrong here
This enforces a specific KMS key for SSE, not in-transit encryption.
- ✗
s3:x-amz-server-side-encryption
Why it's wrong here
This enforces SSE, not in-transit 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 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.