- A
Use S3 server-side encryption with S3 managed keys (SSE-S3)
Why wrong: Encrypts at rest but not in transit.
- B
Enable SSL for data in transit and use VPC endpoints
Why wrong: SSL does not encrypt at rest.
- C
Place all resources in a private VPC subnets with no internet access
Why wrong: VPC alone does not encrypt data.
- D
Use S3 server-side encryption and enable SageMaker inter-container traffic encryption
S3 SSE encrypts at rest; SageMaker inter-container encryption uses TLS for in-transit.
Question 584 of 1,755
MLS-C01 Practice Question: Machine Learning Implementation and Operations
This MLS-C01 practice question tests your understanding of machine learning implementation and operations. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 company is using SageMaker to train a model. The training data includes personally identifiable information (PII). The company must ensure that the data is encrypted at rest and in transit. Which combination of actions meets these 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 S3 server-side encryption and enable SageMaker inter-container traffic encryption
Option D is correct because it combines S3 server-side encryption (SSE-S3) to protect data at rest in the training dataset with SageMaker inter-container traffic encryption, which encrypts data in transit between training containers using TLS. This dual approach satisfies the requirement for encryption both at rest and in transit within the SageMaker training environment.
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 S3 server-side encryption with S3 managed keys (SSE-S3)
Why it's wrong here
Encrypts at rest but not in transit.
- ✗
Enable SSL for data in transit and use VPC endpoints
- ✗
Place all resources in a private VPC subnets with no internet access
Why it's wrong here
VPC alone does not encrypt data.
- ✓
Use S3 server-side encryption and enable SageMaker inter-container traffic encryption
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume VPC isolation or SSL alone satisfies both encryption requirements, but they overlook the need for explicit encryption of inter-container traffic within SageMaker's distributed training environment.
Detailed technical explanation
How to think about this question
SageMaker inter-container traffic encryption uses TLS 1.2 to encrypt communication between training containers within the same training job, which is critical when PII is processed across distributed instances. S3 server-side encryption with SSE-S3 uses AES-256 to encrypt objects at rest, with keys managed by AWS. In a real-world scenario, a healthcare company training a model on patient records would need both layers to comply with HIPAA requirements for encryption at rest and in transit.
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 S3 server-side encryption and enable SageMaker inter-container traffic encryption — Option D is correct because it combines S3 server-side encryption (SSE-S3) to protect data at rest in the training dataset with SageMaker inter-container traffic encryption, which encrypts data in transit between training containers using TLS. This dual approach satisfies the requirement for encryption both at rest and in transit within the SageMaker training environment.
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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