- A
Add a resource-based policy to the Lambda function to allow S3 to invoke it.
Necessary for S3 to trigger Lambda.
- B
Enable S3 versioning on the bucket.
Why wrong: Not required for event notifications.
- C
Create an S3 bucket policy that grants S3 permission to invoke Lambda.
Why wrong: Not required; Lambda resource policy suffices.
- D
Configure an event notification on the S3 bucket for s3:ObjectCreated:* events.
Defines the trigger event.
- E
Set up an Amazon CloudWatch Events rule to detect S3 uploads.
Why wrong: Not used for S3 event notifications.
Question 1,274 of 1,786
How to Configure S3 Event Notifications to Trigger Lambda — AWS Data Engineer Associate
This DEA-C01 practice question tests your understanding of data store management. 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 data engineer is setting up Amazon S3 event notifications to trigger an AWS Lambda function when new objects are uploaded. Which TWO actions are required to enable this?
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
✓
Add a resource-based policy to the Lambda function to allow S3 to invoke it.
Option A is correct because Lambda functions use a resource-based policy (also known as a function policy) to grant permissions to other AWS services, such as S3, to invoke the function. Without this policy, S3 will receive an access denied error when trying to trigger the Lambda function. Option D is correct because you must configure an S3 event notification on the bucket for the `s3:ObjectCreated:*` event type to instruct S3 to send a notification to the Lambda function when new objects are uploaded.
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.
- ✓
Add a resource-based policy to the Lambda function to allow S3 to invoke it.
Why this is correct
Necessary for S3 to trigger Lambda.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Enable S3 versioning on the bucket.
Why it's wrong here
Not required for event notifications.
- ✗
Create an S3 bucket policy that grants S3 permission to invoke Lambda.
Why it's wrong here
Not required; Lambda resource policy suffices.
- ✓
Configure an event notification on the S3 bucket for s3:ObjectCreated:* events.
Why this is correct
Defines the trigger event.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Set up an Amazon CloudWatch Events rule to detect S3 uploads.
Why it's wrong here
Not used for S3 event notifications.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often think an S3 bucket policy is needed to allow S3 to invoke Lambda, but in reality, the permission must be granted on the Lambda function's resource-based policy, not on the bucket.
Detailed technical explanation
How to think about this question
Under the hood, S3 event notifications are delivered via SNS, SQS, or Lambda, and the Lambda resource-based policy uses a statement with `Principal: s3.amazonaws.com` and `Action: lambda:InvokeFunction`. A subtle behavior is that the S3 bucket and Lambda function must be in the same AWS Region, and the event notification configuration can optionally include filters (e.g., prefix/suffix) to reduce unnecessary invocations. In a real-world scenario, forgetting the resource-based policy is a common cause of silent failures where objects are uploaded but the Lambda function never runs.
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 DEA-C01 question test?
Data Store Management — This question tests Data Store Management — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Add a resource-based policy to the Lambda function to allow S3 to invoke it. — Option A is correct because Lambda functions use a resource-based policy (also known as a function policy) to grant permissions to other AWS services, such as S3, to invoke the function. Without this policy, S3 will receive an access denied error when trying to trigger the Lambda function. Option D is correct because you must configure an S3 event notification on the bucket for the `s3:ObjectCreated:*` event type to instruct S3 to send a notification to the Lambda function when new objects are uploaded.
What should I do if I get this DEA-C01 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
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