- A
Use an SQS queue to buffer S3 events and poll from a training instance
Why wrong: Using an SQS queue to buffer S3 events and poll from a training instance is inefficient and not a recommended pattern for triggering training jobs; it introduces unnecessary polling and complexity.
- B
Set up an Amazon EventBridge rule that triggers on S3 Object Created events and targets a Lambda function
Correct. Amazon EventBridge can capture S3 Object Created events and trigger a Lambda function, which can start the SageMaker training job immediately.
- C
Use AWS Step Functions with a scheduled execution
Why wrong: Using AWS Step Functions with a scheduled execution is time-based, not event-driven; it would not trigger on new data arrival unless a schedule aligns with data arrival, which is not guaranteed.
- D
Use CloudWatch Logs to monitor S3 access logs and trigger a Lambda function
Why wrong: Using CloudWatch Logs to monitor S3 access logs is inefficient and indirect; it relies on analyzing logs rather than reacting to actual events, which introduces delays and unnecessary processing.
- E
Configure an S3 event notification to invoke a Lambda function that starts the training job
Correct. Configuring an S3 event notification to invoke a Lambda function directly is a straightforward event-driven approach, as the Lambda function can start the SageMaker training job.
MLS-C01 Amazon EventBridge Practice Question
This MLS-C01 practice question tests your understanding of machine learning implementation and operations. 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. A key principle to apply: amazon EventBridge. 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 company uses SageMaker to run training jobs on a schedule. The training data is stored in an S3 bucket that receives new data every hour. Which TWO approaches can the company use to trigger a training job when new data arrives?
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
Set up an Amazon EventBridge rule that triggers on S3 Object Created events and targets a Lambda function
Both options B and E are correct because they use an event-driven approach to trigger a training job when new data arrives. Option B uses Amazon EventBridge to capture S3 Object Created events and route them to a Lambda function, which starts the SageMaker training job via the AWS SDK. Option E uses the native S3 event notification feature to directly invoke a Lambda function on object creation, which then starts the training job. Both methods are valid and eliminate the need for polling or scheduled jobs.
Key principle: Amazon EventBridge
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 an SQS queue to buffer S3 events and poll from a training instance
Why it's wrong here
Using an SQS queue to buffer S3 events and poll from a training instance is inefficient and not a recommended pattern for triggering training jobs; it introduces unnecessary polling and complexity.
- ✓
Set up an Amazon EventBridge rule that triggers on S3 Object Created events and targets a Lambda function
Why this is correct
Correct. Amazon EventBridge can capture S3 Object Created events and trigger a Lambda function, which can start the SageMaker training job immediately.
Related concept
Amazon EventBridge
- ✗
Use AWS Step Functions with a scheduled execution
Why it's wrong here
Using AWS Step Functions with a scheduled execution is time-based, not event-driven; it would not trigger on new data arrival unless a schedule aligns with data arrival, which is not guaranteed.
- ✗
Use CloudWatch Logs to monitor S3 access logs and trigger a Lambda function
Why it's wrong here
Using CloudWatch Logs to monitor S3 access logs is inefficient and indirect; it relies on analyzing logs rather than reacting to actual events, which introduces delays and unnecessary processing.
- ✓
Configure an S3 event notification to invoke a Lambda function that starts the training job
Why this is correct
Correct. Configuring an S3 event notification to invoke a Lambda function directly is a straightforward event-driven approach, as the Lambda function can start the SageMaker training job.
Related concept
Amazon EventBridge
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap is that candidates often think only S3 event notifications directly to Lambda (Option E) are valid, but Amazon EventBridge (Option B) is equally correct and often preferred for complex architectures. The question asks for TWO approaches, so both B and E must be selected.
Detailed technical explanation
How to think about this question
S3 event notifications can be sent directly to Lambda (Option E) or via EventBridge (Option B), but EventBridge offers advanced filtering, multiple targets, and integration with other AWS services. Under the hood, S3 publishes events to the EventBridge default event bus, where rules can match specific bucket names, object key prefixes, or suffixes, enabling precise triggering conditions. In real-world scenarios, using EventBridge allows you to chain multiple downstream actions, such as sending a notification to SNS or starting a Step Functions workflow, without modifying the S3 bucket configuration.
KKey Concepts to Remember
- Amazon EventBridge
- S3 Event Notifications
- AWS Lambda
- SageMaker Training Job
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
Amazon EventBridge
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.
Review amazon EventBridge, then practise related MLS-C01 questions on the same topic to reinforce the concept.
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FAQ
Questions learners often ask
What does this MLS-C01 question test?
Machine Learning Implementation and Operations — This question tests Machine Learning Implementation and Operations — Amazon EventBridge.
What is the correct answer to this question?
The correct answer is: Set up an Amazon EventBridge rule that triggers on S3 Object Created events and targets a Lambda function — Both options B and E are correct because they use an event-driven approach to trigger a training job when new data arrives. Option B uses Amazon EventBridge to capture S3 Object Created events and route them to a Lambda function, which starts the SageMaker training job via the AWS SDK. Option E uses the native S3 event notification feature to directly invoke a Lambda function on object creation, which then starts the training job. Both methods are valid and eliminate the need for polling or scheduled jobs.
What should I do if I get this MLS-C01 question wrong?
Review amazon EventBridge, then practise related MLS-C01 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
Amazon EventBridge
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Last reviewed: Jul 4, 2026
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