- A
Use client-side encryption and transfer data via HTTP
Why wrong: Client-side encryption is not integrated with SageMaker.
- B
Use SSE-S3 encryption on the S3 bucket and enforce HTTPS
SSE-S3 encrypts at rest; HTTPS encrypts in transit.
- C
Use SSE-KMS encryption on the S3 bucket and disable HTTP
Why wrong: SSE-KMS works, but disabling HTTP is not possible; HTTPS must be enforced.
- D
Use SSE-C encryption on the S3 bucket and HTTPS
Why wrong: SSE-C requires managing customer keys.
- E
Use no encryption on S3 but use HTTPS
Why wrong: Data at rest would not be encrypted.
Question 74 of 1,755
S3 Encryption at Rest and in Transit
This MLS-C01 practice question tests your understanding of machine learning implementation and operations. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
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?
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
Option B is correct because 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.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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
- ✗
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.
Common exam traps
Common exam trap: answer the scenario, not the keyword
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.
Detailed technical explanation
How to think about this question
SSE-S3 uses AES-256 encryption managed by AWS, with each object encrypted with a unique key and the key itself encrypted with a master key that rotates regularly. Enforcing HTTPS on the S3 bucket policy (e.g., via a condition key `aws:SecureTransport`) ensures all API calls use TLS 1.2+, preventing any accidental HTTP access. SageMaker training jobs automatically use the S3 endpoint over HTTPS when the bucket policy enforces it, so no additional configuration is needed.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
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 |
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this MLS-C01 question test?
Machine Learning Implementation and Operations — This question tests Machine Learning Implementation and Operations — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use SSE-S3 encryption on the S3 bucket and enforce HTTPS — Option B is correct because 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.
What should I do if I get this MLS-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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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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