CV0-004 Deployment Practice Question
A cloud architect is designing a serverless application on AWS Lambda. The function needs to process messages from an SQS queue. Which event trigger should be configured for the Lambda function?
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
✓
SQS trigger
AWS Lambda can be triggered by SQS messages. By configuring an SQS trigger, Lambda automatically polls the queue and invokes the function with each message.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
API Gateway
Why it's wrong here
API Gateway invokes Lambda synchronously from inbound HTTP requests, not from queued messages. It is tempting because it is the standard Lambda trigger for REST APIs, and it would be correct for exposing the function as an HTTP endpoint to clients.
- ✓
SQS trigger
Why this is correct
An SQS trigger uses event source mapping, letting Lambda poll the queue and invoke the function with batched messages. This pull-based integration handles scaling and failed-message handling natively, matching the requirement to process queue messages.
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S3 bucket event
Why it's wrong here
S3 bucket events fire on object creation or deletion, so they never deliver SQS queue messages to the function. It is tempting because S3 notifications are a common Lambda trigger, and it would be correct for processing uploaded objects such as images or logs.
- ✗
EventBridge rule
Why it's wrong here
EventBridge rules match events from AWS services or schedules, not the SQS message stream itself. It is tempting because EventBridge integrates with Lambda broadly, and it would be correct for cron-style schedules or reacting to SaaS and AWS service events.
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 |
About these practice questions
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This CV0-004 practice question is part of Courseiva's free CompTIA 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 CV0-004 exam.