- A
Store AWS access keys in the training script
Why wrong: Embedding long-lived credentials in code is insecure and against best practices.
- B
Use an S3 bucket policy that allows public access
Why wrong: Public access would expose the data to anyone, which is insecure.
- C
Specify an IAM role in the SageMaker training job configuration
SageMaker assumes the IAM role to access S3, providing temporary credentials and secure access.
- D
Create a new IAM user for each training job
Why wrong: Managing many IAM users is inefficient and still involves long-lived credentials.
Question 112 of 1,755
MLS-C01 Modeling Practice Question
This MLS-C01 practice question tests your understanding of modeling. 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 Amazon SageMaker to train a model. The training data is stored in an S3 bucket. The team wants to ensure that the training job can access the data securely without using long-lived AWS credentials. Which approach should the team 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
✓
Specify an IAM role in the SageMaker training job configuration
Option C is correct because SageMaker training jobs can assume an IAM role specified in the job configuration to obtain temporary security credentials via AWS Security Token Service (STS). This allows the training job to access the S3 bucket securely without embedding long-lived AWS access keys in code or configuration files.
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.
- ✗
Store AWS access keys in the training script
Why it's wrong here
Embedding long-lived credentials in code is insecure and against best practices.
- ✗
Use an S3 bucket policy that allows public access
Why it's wrong here
Public access would expose the data to anyone, which is insecure.
- ✓
Specify an IAM role in the SageMaker training job configuration
Why this is correct
SageMaker assumes the IAM role to access S3, providing temporary credentials and secure access.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Create a new IAM user for each training job
Why it's wrong here
Managing many IAM users is inefficient and still involves long-lived credentials.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may think embedding credentials in code (Option A) is acceptable for automation, but AWS services like SageMaker are designed to use IAM roles for temporary, scoped access, making long-lived credentials unnecessary and insecure.
Detailed technical explanation
How to think about this question
When you specify an IAM role in the SageMaker training job configuration, SageMaker calls STS AssumeRole to obtain temporary credentials that are scoped to the role's permissions and automatically rotated. These credentials are injected into the training container as environment variables (AWS_ACCESS_KEY_ID, AWS_SECRET_ACCESS_KEY, AWS_SESSION_TOKEN) but are never stored or reused, ensuring secure access to S3 and other AWS resources during the job.
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?
Modeling — This question tests Modeling — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Specify an IAM role in the SageMaker training job configuration — Option C is correct because SageMaker training jobs can assume an IAM role specified in the job configuration to obtain temporary security credentials via AWS Security Token Service (STS). This allows the training job to access the S3 bucket securely without embedding long-lived AWS access keys in code or configuration files.
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: Jun 24, 2026
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