Question 74 of 1,672
MLS-C01 Practice Question: Machine Learning Implementation and Operations
A machine learning team is using SageMaker to train a model. They want to ensure that the training data is encrypted at rest in the S3 bucket and that the data is also encrypted during transit. Which configuration should they use?
⚠ Common exam trap
The trap here is that candidates often overthink encryption options and choose SSE-KMS or SSE-C, not realizing that SSE-S3 with HTTPS enforcement is the simplest and fully compliant solution for the stated 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
✓
Use SSE-S3 encryption on the S3 bucket and enforce HTTPS
SSE-S3 provides server-side encryption at rest for objects in S3, and enforcing HTTPS ensures data is encrypted in transit using TLS. This combination meets the requirements for both encryption at rest and in transit without additional client-side complexity.
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 client-side encryption and transfer data via HTTP
Why it's wrong here
Client-side encryption is not integrated with SageMaker.
- ✓
Use SSE-S3 encryption on the S3 bucket and enforce HTTPS
Why this is correct
SSE-S3 encrypts at rest; HTTPS encrypts in transit.
- ✗
Use SSE-KMS encryption on the S3 bucket and disable HTTP
Why it's wrong here
SSE-KMS works, but disabling HTTP is not possible; HTTPS must be enforced.
- ✗
Use SSE-C encryption on the S3 bucket and HTTPS
Why it's wrong here
SSE-C requires managing customer keys.
- ✗
Use no encryption on S3 but use HTTPS
Why it's wrong here
Data at rest would not be encrypted.
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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Last reviewed: Jul 4, 2026
This MLS-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 MLS-C01 exam.
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