- A
Amazon Simple Workflow Service (SWF)
Why wrong: SWF is an older service; Step Functions is preferred for new projects.
- B
AWS Step Functions
Step Functions provides state machines to orchestrate multi-step workflows.
- C
AWS Data Pipeline
Why wrong: Data Pipeline is designed for data movement and transformation, not general orchestration.
- D
Amazon CloudWatch Events
Why wrong: CloudWatch Events can invoke targets but lacks orchestration capabilities.
Question 142 of 1,755
MLS-C01 Data Engineering Practice Question
This MLS-C01 practice question tests your understanding of data engineering. 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 engineering team needs to orchestrate a complex workflow that involves multiple AWS Glue jobs, Lambda functions, and S3 operations. The workflow must run on a schedule and allow monitoring of each step. Which AWS service should they 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
✓
AWS Step Functions
AWS Step Functions is a serverless orchestration service that lets you coordinate multiple AWS services, including AWS Glue jobs, Lambda functions, and S3 operations, into a state machine workflow. It provides built-in scheduling via Amazon EventBridge (formerly CloudWatch Events) and offers visual monitoring, logging, and error handling for each step, making it the ideal choice for complex, multi-step workflows that require observability.
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.
- ✗
Amazon Simple Workflow Service (SWF)
Why it's wrong here
SWF is an older service; Step Functions is preferred for new projects.
- ✓
AWS Step Functions
Why this is correct
Step Functions provides state machines to orchestrate multi-step workflows.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
AWS Data Pipeline
Why it's wrong here
Data Pipeline is designed for data movement and transformation, not general orchestration.
- ✗
Amazon CloudWatch Events
Why it's wrong here
CloudWatch Events can invoke targets but lacks orchestration capabilities.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse AWS Step Functions with Amazon CloudWatch Events (EventBridge) because both can schedule tasks, but they fail to recognize that EventBridge only triggers a single target per rule and cannot orchestrate multi-step workflows with conditional logic, retries, or parallel execution.
Detailed technical explanation
How to think about this question
AWS Step Functions uses Amazon States Language (ASL) to define state machines, which can include tasks, parallel branches, choices, and retry logic with exponential backoff (e.g., `IntervalSeconds` doubling up to `MaxAttempts`). Under the hood, each state transition is logged in Amazon CloudWatch Logs, and execution history is stored for up to 90 days, enabling detailed monitoring and debugging. In a real-world scenario, a data pipeline might trigger a Glue ETL job, wait for completion via a `.sync` integration, then invoke a Lambda for data validation, and finally copy results to S3 — all with automatic retries on failures and a visual execution trace.
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?
Data Engineering — This question tests Data Engineering — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: AWS Step Functions — AWS Step Functions is a serverless orchestration service that lets you coordinate multiple AWS services, including AWS Glue jobs, Lambda functions, and S3 operations, into a state machine workflow. It provides built-in scheduling via Amazon EventBridge (formerly CloudWatch Events) and offers visual monitoring, logging, and error handling for each step, making it the ideal choice for complex, multi-step workflows that require observability.
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: Jul 4, 2026
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