- A
Configure the S3 bucket to send events to Lambda by adding a Lambda trigger in the S3 bucket properties.
S3 can directly invoke Lambda asynchronously using event notifications.
- B
Configure the S3 bucket to send events to an Amazon SQS queue and have Lambda poll the queue.
Why wrong: This adds unnecessary complexity; S3 can directly invoke Lambda.
- C
Configure the S3 bucket to send events to Amazon CloudWatch Events and have CloudWatch invoke Lambda.
Why wrong: CloudWatch Events can trigger Lambda but not directly from S3 object creation; S3 events are better.
- D
Configure the S3 bucket to send events to an Amazon API Gateway endpoint that triggers the Lambda function.
Why wrong: API Gateway is not needed for S3 event notifications to Lambda.
Question 618 of 1,616
How to Trigger Lambda Asynchronously from S3 Uploads
This DVA-C02 practice question tests your understanding of development with aws services. 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 company is developing a serverless application using AWS Lambda and API Gateway. The application needs to process user uploads to Amazon S3. The Lambda function must be invoked asynchronously after an object is uploaded to an S3 bucket. Which configuration should the developer use 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
✓
Configure the S3 bucket to send events to Lambda by adding a Lambda trigger in the S3 bucket properties.
Option A is correct because S3 can directly invoke Lambda asynchronously via a bucket notification configuration. When an object is uploaded, S3 publishes an event to the Lambda service, which then executes the function without requiring any intermediary services. This is the simplest and most direct way to trigger a Lambda function from an S3 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.
- ✓
Configure the S3 bucket to send events to Lambda by adding a Lambda trigger in the S3 bucket properties.
Why this is correct
S3 can directly invoke Lambda asynchronously using event notifications.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Configure the S3 bucket to send events to an Amazon SQS queue and have Lambda poll the queue.
Why it's wrong here
This adds unnecessary complexity; S3 can directly invoke Lambda.
- ✗
Configure the S3 bucket to send events to Amazon CloudWatch Events and have CloudWatch invoke Lambda.
Why it's wrong here
CloudWatch Events can trigger Lambda but not directly from S3 object creation; S3 events are better.
- ✗
Configure the S3 bucket to send events to an Amazon API Gateway endpoint that triggers the Lambda function.
Why it's wrong here
API Gateway is not needed for S3 event notifications to Lambda.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may overcomplicate the solution by introducing unnecessary intermediary services (like SQS or API Gateway) when the direct S3-to-Lambda trigger is the simplest and most appropriate asynchronous invocation method.
Detailed technical explanation
How to think about this question
Under the hood, S3 bucket notifications use a push-based model where S3 publishes events to a configured destination (Lambda, SQS, or SNS) via the S3 service's internal event system. For Lambda, S3 uses the `Invoke` API with `InvocationType: Event` to ensure asynchronous execution. A subtle behavior is that S3 event notifications are delivered at least once, so Lambda 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 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: Configure the S3 bucket to send events to Lambda by adding a Lambda trigger in the S3 bucket properties. — Option A is correct because S3 can directly invoke Lambda asynchronously via a bucket notification configuration. When an object is uploaded, S3 publishes an event to the Lambda service, which then executes the function without requiring any intermediary services. This is the simplest and most direct way to trigger a Lambda function from an S3 event.
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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