- A
API Gateway
Why wrong: API Gateway triggers Lambda via HTTP requests, not S3 events.
- B
EventBridge
Why wrong: EventBridge can trigger Lambda but is not the simplest direct trigger for S3 events.
- C
S3
S3 can invoke Lambda directly on object creation events.
- D
SQS
Why wrong: SQS can trigger Lambda but is not directly from S3; requires S3 to send to SQS first.
Question 251 of 997
CV0-004 Deployment Practice Question
This CV0-004 practice question tests your understanding of deployment. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 cloud engineer needs to deploy a serverless function that runs when a new object is uploaded to an S3 bucket. Which AWS service event trigger should be configured?
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
✓
S3
Amazon S3 can directly invoke AWS Lambda when a new object is uploaded by configuring an S3 event notification on the bucket. This native integration allows the S3 service to trigger the function without any intermediary service, making option C the correct choice for a serverless function triggered by an S3 upload event.
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.
- ✗
API Gateway
- ✗
EventBridge
Why it's wrong here
EventBridge can trigger Lambda but is not the simplest direct trigger for S3 events.
- ✓
S3
Why this is correct
S3 can invoke Lambda directly on object creation events.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
SQS
Why it's wrong here
SQS can trigger Lambda but is not directly from S3; requires S3 to send to SQS first.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between direct service integrations (S3 → Lambda) and event bus patterns (EventBridge), where candidates may overcomplicate by choosing EventBridge when the native S3 trigger is simpler and sufficient.
Detailed technical explanation
How to think about this question
When S3 event notifications are configured, the bucket publishes a JSON event record to the configured destination (e.g., Lambda, SQS, SNS) for each qualifying object operation. The Lambda function receives the event payload containing bucket name, object key, size, and ETag, enabling it to process the object directly. A subtle behavior is that S3 event notifications are typically delivered within seconds but are 'at least once' in nature, so functions should be idempotent to handle potential duplicate invocations.
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 practitioner preparing for the CV0-004 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
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 |
What to study next
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FAQ
Questions learners often ask
What does this CV0-004 question test?
Deployment — This question tests Deployment — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: S3 — Amazon S3 can directly invoke AWS Lambda when a new object is uploaded by configuring an S3 event notification on the bucket. This native integration allows the S3 service to trigger the function without any intermediary service, making option C the correct choice for a serverless function triggered by an S3 upload event.
What should I do if I get this CV0-004 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 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.
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