MLS-C01 Modeling Practice Question
Network Topology
A data scientist runs a training job that fails. The CLI output is shown in the exhibit. What is the MOST likely cause of the failure?
⚠ Common exam trap
Many candidates confuse S3 permission errors (403) with bucket-not-found errors (404), leading them to incorrectly select the IAM role permission option when the actual issue is a missing S3 path.
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
✓
The S3 bucket or prefix does not exist.
The CLI output shows an error indicating that the S3 bucket or prefix does not exist. This is a common failure when the training job's input data path is incorrect, as SageMaker attempts to read from the specified S3 location and fails if the bucket or prefix is missing. The error message directly points to this issue, making it the most likely cause.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The S3 bucket or prefix does not exist.
Why this is correct
The error message explicitly says the S3 URI is not found.
- ✗
The channel name is misspelled.
Why it's wrong here
The channel name matches the input config.
- ✗
The instance type ml.m5.large is too small.
Why it's wrong here
The error is not about instance size.
- ✗
The IAM role does not have s3:GetObject permission.
Why it's wrong here
A permissions error would be different, not 'not found'.
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
Related to this question
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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.