- A
Amazon S3 Event Notifications
S3 can directly invoke Lambda asynchronously on object creation.
- B
Amazon SQS
Why wrong: S3 cannot directly send to SQS; requires S3 Event Notifications to SQS.
- C
Amazon API Gateway
Why wrong: API Gateway is synchronous; not suitable for async processing.
- D
AWS Step Functions
Why wrong: Step Functions can orchestrate but is not the trigger.
Question 377 of 1,616
Trigger Lambda Asynchronously with S3 Event Notifications
This DVA-C02 practice question tests your understanding of development with aws services. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 that processes images uploaded to an S3 bucket. Each image must be resized and then stored in a different S3 bucket. The process must be asynchronous and fault-tolerant. Which AWS service should 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 S3 Event Notifications
Amazon S3 Event Notifications are the correct trigger because they natively support event-driven architectures where S3 object creation events (e.g., s3:ObjectCreated:Put) can directly invoke a Lambda function. This enables asynchronous processing of uploaded images without any intermediate polling or custom integration, ensuring fault tolerance through Lambda's built-in retry mechanism and dead-letter queue (DLQ) support.
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.
- ✓
Amazon S3 Event Notifications
Why this is correct
S3 can directly invoke Lambda asynchronously on object creation.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Amazon SQS
Why it's wrong here
S3 cannot directly send to SQS; requires S3 Event Notifications to SQS.
- ✗
Amazon API Gateway
Why it's wrong here
API Gateway is synchronous; not suitable for async processing.
- ✗
AWS Step Functions
Why it's wrong here
Step Functions can orchestrate but is not the trigger.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse the service that triggers the Lambda (S3 Event Notifications) with the service that stores or routes the event data (SQS or Step Functions), leading them to pick an option that adds unnecessary complexity or is designed for a different use case.
Detailed technical explanation
How to think about this question
Under the hood, S3 Event Notifications use a push-based model where S3 sends a JSON event record to the Lambda function via an internal AWS-managed endpoint, with the function receiving the bucket name and object key. A subtle behavior is that S3 event notifications are delivered on a best-effort basis and may occasionally be duplicated, so the Lambda function should be idempotent to handle duplicate invocations. In a real-world scenario, if the image processing fails, Lambda's asynchronous invocation automatically retries twice and can route failed events to a DLQ for later analysis, ensuring fault tolerance without manual intervention.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
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
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: Amazon S3 Event Notifications — Amazon S3 Event Notifications are the correct trigger because they natively support event-driven architectures where S3 object creation events (e.g., s3:ObjectCreated:Put) can directly invoke a Lambda function. This enables asynchronous processing of uploaded images without any intermediate polling or custom integration, ensuring fault tolerance through Lambda's built-in retry mechanism and dead-letter queue (DLQ) support.
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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