- A
AWS Step Functions
Correct. AWS Step Functions is a fully managed service that lets you coordinate multiple AWS services into stateful, scalable workflows. It supports sequencing, parallel execution, error handling, and retries, making it ideal for orchestrating a series of Lambda functions in a defined order.
- B
Amazon Simple Queue Service (SQS)
Why wrong: Incorrect. Amazon SQS is a message queuing service used for decoupling application components and buffering requests. It does not provide workflow orchestration, state management, or the ability to define and execute a sequence of steps with error handling.
- C
AWS Batch
Why wrong: Incorrect. AWS Batch is a service for running batch computing workloads at scale, typically on EC2 or Fargate. It is not designed for orchestrating event-driven serverless functions in a predefined sequence, nor does it natively integrate with Lambda for step coordination.
- D
Amazon EventBridge
Why wrong: Incorrect. Amazon EventBridge is a serverless event bus that connects application data from various sources and routes events to targets like Lambda. While it can trigger functions based on events, it does not provide built-in state management or the ability to define and execute an ordered workflow with retry logic.
CLF-C02 Cloud Technology and Services Practice Question
This CLF-C02 practice question tests your understanding of cloud technology and services. 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 company has a serverless application built with AWS Lambda. The application requires a series of functions to run in a specific order: after a user uploads a file, a validation function must run, then a processing function, and finally a metadata storage function. The company needs a service to coordinate these steps, manage state, handle errors, and automatically retry failed functions based on defined conditions. Which AWS service should the company use to meet these requirements?
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 into a flexible, visual workflow. It directly meets the requirement to run Lambda functions in a specific order, manage state between steps, handle errors with built-in retry logic, and define conditions for automatic retries using Amazon States Language (ASL). This makes it the ideal choice for orchestrating a multi-step serverless application with error handling and state management.
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
Why this is correct
Correct. AWS Step Functions is a fully managed service that lets you coordinate multiple AWS services into stateful, scalable workflows. It supports sequencing, parallel execution, error handling, and retries, making it ideal for orchestrating a series of Lambda functions in a defined order.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Amazon Simple Queue Service (SQS)
Why it's wrong here
Incorrect. Amazon SQS is a message queuing service used for decoupling application components and buffering requests. It does not provide workflow orchestration, state management, or the ability to define and execute a sequence of steps with error handling.
When this WOULD be correct
A company needs to decouple microservices and buffer requests between a producer and consumer, where messages are processed independently and asynchronously. For example, a web application sends order data to SQS, and a Lambda function polls the queue to process each order without requiring ordered execution or state management.
- ✗
AWS Batch
Why it's wrong here
Incorrect. AWS Batch is a service for running batch computing workloads at scale, typically on EC2 or Fargate. It is not designed for orchestrating event-driven serverless functions in a predefined sequence, nor does it natively integrate with Lambda for step coordination.
When this WOULD be correct
A company needs to run a large-scale, compute-intensive batch job, such as rendering a video or processing a massive dataset, where the job can be parallelized across multiple compute resources. AWS Batch would be the correct service to manage the job scheduling, scaling, and execution on EC2 or Spot Instances.
- ✗
Amazon EventBridge
Why it's wrong here
Incorrect. Amazon EventBridge is a serverless event bus that connects application data from various sources and routes events to targets like Lambda. While it can trigger functions based on events, it does not provide built-in state management or the ability to define and execute an ordered workflow with retry logic.
When this WOULD be correct
A company needs to react to events from multiple sources (e.g., S3, DynamoDB) and invoke a single Lambda function or send the event to multiple targets based on rules. For example, when a file is uploaded to S3, EventBridge can route the event to a Lambda function for validation and also to a CloudWatch log for auditing.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The CLF-C02 exam frequently reuses these exact scenarios with slightly different constraints.
✓AWS Step FunctionsCorrect answer▾
Why this is correct
Correct. AWS Step Functions is a fully managed service that lets you coordinate multiple AWS services into stateful, scalable workflows. It supports sequencing, parallel execution, error handling, and retries, making it ideal for orchestrating a series of Lambda functions in a defined order.
✗Amazon Simple Queue Service (SQS)Wrong answer — click to see why▾
Why this is wrong here
Amazon SQS is a message queue service that decouples components but does not orchestrate a sequence of steps, manage state, or handle retries with conditional logic. It cannot coordinate multiple Lambda functions in a specific order or implement error handling workflows.
★ When this WOULD be the correct answer
A company needs to decouple microservices and buffer requests between a producer and consumer, where messages are processed independently and asynchronously. For example, a web application sends order data to SQS, and a Lambda function polls the queue to process each order without requiring ordered execution or state management.
Why candidates choose this
Candidates may think SQS can coordinate Lambda functions by chaining queues, but they overlook that SQS lacks built-in workflow orchestration, state tracking, and conditional retry logic that Step Functions provides.
✗AWS BatchWrong answer — click to see why▾
Why this is wrong here
AWS Batch is designed for batch computing jobs, not for orchestrating a sequence of Lambda functions with state management, error handling, and retries. It lacks the built-in workflow coordination and state machine capabilities required for this serverless application.
★ When this WOULD be the correct answer
A company needs to run a large-scale, compute-intensive batch job, such as rendering a video or processing a massive dataset, where the job can be parallelized across multiple compute resources. AWS Batch would be the correct service to manage the job scheduling, scaling, and execution on EC2 or Spot Instances.
Why candidates choose this
Candidates may confuse 'batch processing' with 'sequential processing steps' and think AWS Batch can handle the orchestration, not realizing it lacks the workflow state management and retry logic of Step Functions.
✗Amazon EventBridgeWrong answer — click to see why▾
Why this is wrong here
Amazon EventBridge is an event bus service for routing events between decoupled services, but it does not provide built-in orchestration, state management, or error handling with retry logic for a sequence of Lambda functions. It lacks the ability to define a workflow with ordered steps and conditional retries.
★ When this WOULD be the correct answer
A company needs to react to events from multiple sources (e.g., S3, DynamoDB) and invoke a single Lambda function or send the event to multiple targets based on rules. For example, when a file is uploaded to S3, EventBridge can route the event to a Lambda function for validation and also to a CloudWatch log for auditing.
Why candidates choose this
Candidates may confuse event-driven architecture with workflow orchestration, thinking that EventBridge's ability to trigger Lambda functions in response to events can coordinate a sequence, but it cannot manage state or enforce order across multiple functions.
Analysis generated from the official CLF-C02blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Common exam trap: answer the scenario, not the keyword
AWS often tests the distinction between orchestration (Step Functions) and simple messaging (SQS) or batch processing (AWS Batch), so the trap here is that candidates might choose SQS thinking it can coordinate steps, but SQS lacks workflow state management and built-in retry conditions.
Detailed technical explanation
How to think about this question
AWS Step Functions uses Amazon States Language (ASL) to define state machines, which can include sequential steps, parallel branches, and choice states. Under the hood, it manages execution history and state transitions, allowing you to implement complex retry policies with exponential backoff and maximum retry counts. In a real-world scenario, if the validation function fails due to a transient error, Step Functions can automatically retry it up to 3 times with a 5-second delay before routing to a fallback step, all without custom code.
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 CLF-C02 question test?
Cloud Technology and Services — This question tests Cloud Technology and Services — 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 into a flexible, visual workflow. It directly meets the requirement to run Lambda functions in a specific order, manage state between steps, handle errors with built-in retry logic, and define conditions for automatic retries using Amazon States Language (ASL). This makes it the ideal choice for orchestrating a multi-step serverless application with error handling and state management.
What should I do if I get this CLF-C02 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 30, 2026
This CLF-C02 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 CLF-C02 exam.
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