MLS-C01 Practice Question: Machine Learning Implementation and Operations
Which THREE actions should be taken to ensure data security when training a model using Amazon SageMaker with data stored in Amazon S3? (Choose 3.)
⚠ Common exam trap
Many exam-takers confuse service-level bucket policies (like 'Deny all except SageMaker service') with IAM role-based access, leading them to select option B, which is technically invalid because SageMaker does not have a service principal for S3 access.
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 a VPC to isolate the SageMaker training job
Using a VPC to isolate the SageMaker training job ensures that the training instance runs within a private network, preventing direct internet access and allowing traffic to flow only through controlled network interfaces. This reduces the attack surface and helps meet compliance requirements for data security.
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 a VPC to isolate the SageMaker training job
Why this is correct
Network isolation.
- ✗
Apply an S3 bucket policy that denies all access except from the SageMaker service
Why it's wrong here
SageMaker uses IAM roles, not bucket policies directly.
- ✗
Attach an EBS volume for storing training data
Why it's wrong here
Training data comes from S3, not EBS.
- ✓
Enable server-side encryption on the S3 bucket
Why this is correct
Encrypts data at rest.
- ✓
Use an IAM role with least privilege permissions
Why this is correct
Minimizes access.
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.