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MLA-C01 Practice Question: A company uses Amazon SageMaker to train and…
A company uses Amazon SageMaker to train and deploy machine learning models. The security team requires that all data in transit between the training job and S3 be encrypted, and that no data traverses the public internet. Which configuration should the company use?
⚠ Common exam trap
Watch out — candidates often confuse encryption in transit (HTTPS) with keeping traffic off the public internet, not realizing that HTTPS can still traverse the public internet unless a VPC endpoint or Direct Connect is used.
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
✓
Create a VPC with S3 VPC endpoints, attach a VPC-only policy to the SageMaker execution role, and enable KMS encryption for training jobs.
It ensures that data in transit between SageMaker and S3 stays within the AWS network and is encrypted. By creating a VPC with S3 VPC endpoints, traffic uses AWS private IPs and never traverses the public internet. Attaching a VPC-only policy to the SageMaker execution role restricts the training job to only use VPC endpoints, and enabling KMS encryption for the training job ensures data is encrypted in transit (via TLS) and at rest.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Create a VPC with S3 VPC endpoints, attach a VPC-only policy to the SageMaker execution role, and enable KMS encryption for training jobs.
Why this is correct
S3 VPC endpoints keep traffic within AWS network, and KMS encrypts data in transit and at rest.
- ✗
Use an S3 bucket with SSE-S3 encryption and restrict bucket access to a VPC.
Why it's wrong here
SSE-S3 only encrypts at rest, not in transit; VPC restriction doesn't guarantee encryption in transit.
- ✗
Enable default encryption on the S3 bucket and use HTTPS for all SageMaker endpoints.
Why it's wrong here
HTTPS encrypts in transit but does not keep traffic within the VPC; it may still go over the internet.
- ✗
Create a VPC with a NAT gateway, and configure SageMaker to use the VPC and enforce HTTPS.
Why it's wrong here
NAT gateway allows outbound internet, which may expose traffic; HTTPS alone doesn't ensure no public internet traversal.
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 MLA-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 MLA-C01 exam.