CV0-004 Deployment Practice Question
A developer is deploying a serverless function that processes images uploaded to an S3 bucket. The function should be triggered automatically whenever a new object is created in the bucket. Which event source should be configured to invoke 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 S3
S3 can send events to Lambda when objects are created, enabling automatic processing without polling.
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 SQS
Why it's wrong here
SQS is a message queue; Lambda can poll it, but it is not a direct S3 event trigger.
- ✗
Amazon EventBridge
Why it's wrong here
EventBridge can route events, but S3 can directly invoke Lambda without it.
- ✓
Amazon S3
Why this is correct
Lambda can be configured to trigger on S3 events such as s3:ObjectCreated:*.
- ✗
API Gateway
Why it's wrong here
API Gateway creates HTTP endpoints, not object creation triggers in S3.
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 |
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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.