- A
Configure the event notification with a prefix filter set to 'uploads/' and event type 's3:ObjectCreated:*'.
This ensures only objects created under the 'uploads/' prefix trigger the Lambda function, minimizing unnecessary invocations.
- B
Configure a single event notification for all objects and filter on the prefix inside the Lambda function.
Why wrong: While this works, it results in unnecessary invocations for objects outside the target subfolder, increasing costs and processing overhead.
- C
Configure the event notification using object tags to filter events.
Why wrong: S3 event notifications do not support filtering by object tags; only prefix and suffix filters are available.
- D
Use AWS CloudTrail to detect S3 PutObject events and trigger Lambda.
Why wrong: CloudTrail is for auditing and does not provide real-time event-driven invocation of Lambda functions.
DVA-C02 Development with AWS Services Practice Question
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 developer is writing an AWS Lambda function that processes files uploaded to an S3 bucket. The function should only be triggered when a new object is created in a specific subfolder (e.g., /uploads/). Which S3 event notification configuration should the developer use?
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 event notification with a prefix filter set to 'uploads/' and event type 's3:ObjectCreated:*'.
Option A is correct because S3 event notifications support prefix filtering, which allows you to specify a key prefix (e.g., 'uploads/') so that only object creation events in that subfolder trigger the Lambda function. By setting the event type to 's3:ObjectCreated:*', the function responds to all object creation operations (PUT, POST, Copy, etc.) within the filtered path, meeting the requirement precisely without unnecessary invocations.
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 event notification with a prefix filter set to 'uploads/' and event type 's3:ObjectCreated:*'.
Why this is correct
This ensures only objects created under the 'uploads/' prefix trigger the Lambda function, minimizing unnecessary invocations.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Configure a single event notification for all objects and filter on the prefix inside the Lambda function.
Why it's wrong here
While this works, it results in unnecessary invocations for objects outside the target subfolder, increasing costs and processing overhead.
- ✗
Configure the event notification using object tags to filter events.
Why it's wrong here
S3 event notifications do not support filtering by object tags; only prefix and suffix filters are available.
- ✗
Use AWS CloudTrail to detect S3 PutObject events and trigger Lambda.
Why it's wrong here
CloudTrail is for auditing and does not provide real-time event-driven invocation of Lambda functions.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates might think filtering inside the Lambda function is acceptable (Option B), but AWS best practice and the exam emphasize configuring filtering at the event source to minimize invocations and follow the principle of least privilege for triggers.
Detailed technical explanation
How to think about this question
S3 event notifications use a filter rule that can include both a prefix and a suffix, allowing granular control over which objects trigger the event. Under the hood, S3 evaluates the object key against the filter before publishing the notification to the configured destination (e.g., Lambda, SQS, SNS), ensuring that only matching events are sent. In a real-world scenario, if the bucket contains multiple subfolders (e.g., /uploads/, /processed/), using a prefix filter prevents the Lambda function from being invoked for objects in other paths, reducing cost and avoiding unintended processing.
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.
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 event notification with a prefix filter set to 'uploads/' and event type 's3:ObjectCreated:*'. — Option A is correct because S3 event notifications support prefix filtering, which allows you to specify a key prefix (e.g., 'uploads/') so that only object creation events in that subfolder trigger the Lambda function. By setting the event type to 's3:ObjectCreated:*', the function responds to all object creation operations (PUT, POST, Copy, etc.) within the filtered path, meeting the requirement precisely without unnecessary invocations.
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: Jun 11, 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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