- A
AWS Step Functions with a scheduled trigger.
Why wrong: Scheduled trigger polls, not event-driven.
- B
Amazon Simple Workflow Service (SWF) decider.
Why wrong: SWF is more complex and not directly triggered by S3 events.
- C
Amazon EventBridge with a rule matching S3 object creation.
EventBridge can invoke a Lambda function that starts the training job.
- D
Amazon Simple Queue Service (SQS) with a polling script.
Why wrong: SQS requires polling and additional logic to start training.
Question 499 of 1,000
MLA-C01 Practice Question: ML Solution Monitoring, Maintenance and Security
This MLA-C01 practice question tests your understanding of ml solution monitoring, maintenance and security. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 data scientist trained a model using SageMaker and wants to automate the retraining process when new data becomes available. Which AWS service is best suited to trigger a SageMaker training job based on an S3 event?
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
✓
Amazon EventBridge with a rule matching S3 object creation.
Amazon EventBridge is the correct choice because it can directly capture S3 events (such as ObjectCreated) via a rule and invoke a SageMaker training job as a target. This event-driven architecture eliminates the need for polling or scheduled checks, enabling immediate retraining when new data arrives in S3.
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.
- ✗
AWS Step Functions with a scheduled trigger.
Why it's wrong here
Scheduled trigger polls, not event-driven.
- ✗
Amazon Simple Workflow Service (SWF) decider.
Why it's wrong here
SWF is more complex and not directly triggered by S3 events.
- ✓
Amazon EventBridge with a rule matching S3 object creation.
Why this is correct
EventBridge can invoke a Lambda function that starts the training job.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Amazon Simple Queue Service (SQS) with a polling script.
Why it's wrong here
SQS requires polling and additional logic to start training.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse scheduled triggers (Step Functions) with event-driven triggers, overlooking that EventBridge is the native AWS service for reacting to S3 events in real time without polling or custom scripts.
Detailed technical explanation
How to think about this question
Under the hood, EventBridge uses a default event bus that automatically receives S3 events when S3 Event Notifications are configured. The rule matches the event pattern (e.g., 'source': ['aws.s3'], 'detail-type': ['Object Created']) and routes it to a SageMaker training job via a Lambda function or directly through the SageMaker CreateTrainingJob API. In real-world scenarios, this pattern is critical for continuous learning pipelines where model drift must be addressed as soon as new batches of data arrive, avoiding stale predictions.
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 MLA-C01 question test?
ML Solution Monitoring, Maintenance and Security — This question tests ML Solution Monitoring, Maintenance and Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Amazon EventBridge with a rule matching S3 object creation. — Amazon EventBridge is the correct choice because it can directly capture S3 events (such as ObjectCreated) via a rule and invoke a SageMaker training job as a target. This event-driven architecture eliminates the need for polling or scheduled checks, enabling immediate retraining when new data arrives in S3.
What should I do if I get this MLA-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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Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
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Last reviewed: Jul 4, 2026
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.
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