MLS-C01 Practice Question: Machine Learning Implementation and Operations
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?
⚠ Common exam trap
Many exam-takers 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.
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
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.
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
Why it's wrong here
SSL does not encrypt at rest.
- ✗
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
Why this is correct
S3 SSE encrypts at rest; SageMaker inter-container encryption uses TLS for 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 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.