CV0-004 Deployment Practice Question
A cloud engineer is deploying a serverless function using AWS Lambda. The function needs to process messages from an SQS queue. Which event source should be configured to trigger 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
✓
Amazon SQS
Lambda can be triggered by SQS, S3, API Gateway, etc. For SQS, the trigger is SQS. S3 triggers on object events; API Gateway for HTTP; EventBridge for events.
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 S3
Why it's wrong here
S3 triggers on bucket events, not SQS.
- ✓
Amazon SQS
Why this is correct
Amazon SQS is a supported Lambda event source; configuring it lets Lambda poll the queue and invoke the function with batched messages. This matches the requirement to process queue messages, unlike push-based sources such as API Gateway or S3.
- ✗
Amazon API Gateway
Why it's wrong here
API Gateway invokes Lambda on HTTP requests, not on SQS queue messages, so it cannot poll the queue. It tempts because API Gateway is a common Lambda trigger for REST endpoints, but processing queued messages requires an SQS event source mapping instead.
- ✗
Amazon EventBridge
Why it's wrong here
EventBridge routes events matching rules to targets, but it does not poll an SQS queue for messages; SQS itself must be the event source. It tempts because EventBridge commonly triggers Lambda on schedules or AWS service events, not on queue consumption.
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 |
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.