- A
Set up an Amazon EventBridge rule to capture SQS events and invoke Lambda.
Why wrong: EventBridge does not directly capture SQS events.
- B
Use Amazon SNS to subscribe to the SQS queue and trigger Lambda.
Why wrong: SNS cannot subscribe to SQS; SQS can subscribe to SNS.
- C
Use AWS Step Functions to poll the SQS queue and invoke Lambda.
Why wrong: Step Functions does not directly poll SQS; it can integrate but is not the simplest trigger.
- D
Configure an SQS event source mapping on the Lambda function.
Lambda can poll SQS and invoke the function automatically.
Question 1,499 of 1,616
How to Configure SQS Event Source Mapping for Lambda
This DVA-C02 practice question tests your understanding of development with aws 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 developer is building a serverless application using AWS Lambda. The application needs to process messages from an Amazon SQS queue and store results in an Amazon DynamoDB table. Which AWS service should the developer use to trigger the Lambda function when new messages arrive in the SQS queue?
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
✓
Configure an SQS event source mapping on the Lambda function.
Option D is correct because AWS Lambda supports native SQS event source mappings, which allow Lambda to poll an SQS queue and invoke the function automatically when new messages arrive. This integration handles the polling, batch retrieval, and deletion of messages from the queue, making it the simplest and most efficient way to process SQS messages with Lambda.
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.
- ✗
Set up an Amazon EventBridge rule to capture SQS events and invoke Lambda.
Why it's wrong here
EventBridge does not directly capture SQS events.
- ✗
Use Amazon SNS to subscribe to the SQS queue and trigger Lambda.
Why it's wrong here
SNS cannot subscribe to SQS; SQS can subscribe to SNS.
- ✗
Use AWS Step Functions to poll the SQS queue and invoke Lambda.
Why it's wrong here
Step Functions does not directly poll SQS; it can integrate but is not the simplest trigger.
- ✓
Configure an SQS event source mapping on the Lambda function.
Why this is correct
Lambda can poll SQS and invoke the function automatically.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse the direction of SNS-SQS integration, thinking SNS can subscribe to SQS to trigger Lambda, when in fact SNS publishes to SQS and Lambda must be triggered via an event source mapping or SNS topic subscription directly.
Detailed technical explanation
How to think about this question
The SQS event source mapping uses a long-polling mechanism (ReceiveMessage with WaitTimeSeconds up to 20 seconds) to reduce empty responses and costs. Lambda automatically scales the number of concurrent pollers based on the number of messages in the queue, up to a maximum of 1,000 concurrent executions per function. A common real-world scenario is processing high-throughput order messages where the event source mapping handles batch failures by returning unprocessed messages to the queue after a configurable number of retries.
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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
Quick reference
Cloud Service Model Comparison
| Model | You Manage | Provider Manages | Examples |
|---|---|---|---|
| IaaS | OS, runtime, apps, data | Hardware, hypervisor, networking | EC2, Azure VMs, GCP Compute Engine |
| PaaS | Apps and data | OS, runtime, middleware, hardware | Elastic Beanstalk, Azure App Service |
| SaaS | Data and settings only | Everything else | Microsoft 365, Salesforce, Workday |
| FaaS / Serverless | Function code only | Infra, scaling, runtime | Lambda, Azure Functions, Cloud Run |
| CaaS | Containers and apps | Kubernetes, OS, hardware | EKS, AKS, GKE |
What to study next
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FAQ
Questions learners often ask
What does this DVA-C02 question test?
Development with AWS Services — This question tests Development with AWS Services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Configure an SQS event source mapping on the Lambda function. — Option D is correct because AWS Lambda supports native SQS event source mappings, which allow Lambda to poll an SQS queue and invoke the function automatically when new messages arrive. This integration handles the polling, batch retrieval, and deletion of messages from the queue, making it the simplest and most efficient way to process SQS messages with Lambda.
What should I do if I get this DVA-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: Jul 4, 2026
This DVA-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 DVA-C02 exam.
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