- A
Attach an IAM execution role to Lambda with permission to receive messages from SQS.
Correct: Lambda needs permission to poll the queue.
- B
Configure a resource-based policy on the SQS queue to allow Lambda invocation.
Why wrong: Incorrect: Event source mapping uses the Lambda service principal.
- C
Create an event source mapping in Lambda to poll the SQS queue.
Correct: This is how Lambda is triggered by SQS.
- D
Set up a dead-letter queue for failed messages.
Why wrong: Incorrect: DLQ is optional, not required.
- E
Place the Lambda function in a VPC to access the SQS queue.
Why wrong: Incorrect: SQS is accessible over the internet without VPC.
Question 375 of 1,616
Required Steps to Connect SQS Queue to Lambda Function
This DVA-C02 practice question tests your understanding of development with aws services. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 designing a serverless application using AWS Lambda. The function needs to process messages from an Amazon SQS queue. The developer wants to configure the Lambda function to be triggered by the SQS queue. Which TWO actions are required? (Choose TWO.)
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
✓
Attach an IAM execution role to Lambda with permission to receive messages from SQS.
Option A is correct because the Lambda function needs an IAM execution role with permissions to call the SQS ReceiveMessage, DeleteMessage, and GetQueueAttributes actions. Without these permissions, the Lambda service cannot poll messages from the queue. Option C is correct because an event source mapping is required to connect the SQS queue to the Lambda function; this mapping defines the polling configuration, batch size, and concurrency settings.
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.
- ✓
Attach an IAM execution role to Lambda with permission to receive messages from SQS.
Why this is correct
Correct: Lambda needs permission to poll the queue.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Configure a resource-based policy on the SQS queue to allow Lambda invocation.
Why it's wrong here
Incorrect: Event source mapping uses the Lambda service principal.
- ✓
Create an event source mapping in Lambda to poll the SQS queue.
Why this is correct
Correct: This is how Lambda is triggered by SQS.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Set up a dead-letter queue for failed messages.
Why it's wrong here
Incorrect: DLQ is optional, not required.
- ✗
Place the Lambda function in a VPC to access the SQS queue.
Why it's wrong here
Incorrect: SQS is accessible over the internet without VPC.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse the direction of permissions, thinking SQS needs a resource-based policy to invoke Lambda, when in fact Lambda needs an execution role to poll SQS, and SQS needs a resource-based policy on the Lambda function to invoke it.
Detailed technical explanation
How to think about this question
Under the hood, the Lambda service uses long polling (with a configurable WaitTimeSeconds up to 20 seconds) to reduce empty responses and costs. The event source mapping manages the polling process and automatically scales the number of concurrent Lambda invocations based on the number of messages in the queue, up to a maximum of 1,000 concurrent executions. A real-world scenario where this matters is when processing high-throughput queues: if the batch size is too large or the concurrency limit is too low, messages may accumulate and trigger the visibility timeout repeatedly.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
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
Got this wrong? Here's your next step.
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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: Attach an IAM execution role to Lambda with permission to receive messages from SQS. — Option A is correct because the Lambda function needs an IAM execution role with permissions to call the SQS ReceiveMessage, DeleteMessage, and GetQueueAttributes actions. Without these permissions, the Lambda service cannot poll messages from the queue. Option C is correct because an event source mapping is required to connect the SQS queue to the Lambda function; this mapping defines the polling configuration, batch size, and concurrency settings.
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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