- A
AWS::Lambda::Permission
Correct. This resource explicitly grants the S3 service principal permission to invoke the Lambda function.
- B
AWS::S3::BucketPolicy
Why wrong: A bucket policy controls access to the S3 bucket itself, not the permissions for S3 to invoke Lambda.
- C
AWS::Lambda::EventSourceMapping
Why wrong: Event source mappings are used for streaming or poll-based sources like SQS, DynamoDB Streams, or Kinesis, not for S3 event notifications.
- D
AWS::IAM::Role
Why wrong: An IAM role defines what actions the Lambda function can perform, not who can invoke it.
Question 145 of 1,616
Grant S3 Bucket Permission to Invoke Lambda in AWS SAM
This DVA-C02 practice question tests your understanding of deployment. 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. A key principle to apply: aWS::Lambda::Permission. 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 deploying a serverless application using AWS SAM. The application includes an AWS Lambda function that is triggered by an S3 bucket event when an object is created. The developer wants to ensure that the Lambda function has the correct permissions to be invoked by S3. Which resource should the developer define in the SAM template?
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
✓
AWS::Lambda::Permission
AWS::Lambda::Permission is the correct resource because it explicitly grants the S3 service principal permission to invoke the Lambda function when an object is created. In AWS SAM, this resource is automatically generated when you define an S3 event source on a Lambda function, but if you need to declare it manually or override permissions, you use AWS::Lambda::Permission with a SourceArn pointing to the S3 bucket and a SourceAccount to prevent confused deputy attacks.
Key principle: AWS::Lambda::Permission
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
AWS::Lambda::Permission
Why this is correct
Correct. This resource explicitly grants the S3 service principal permission to invoke the Lambda function.
Related concept
AWS::Lambda::Permission
- ✗
AWS::S3::BucketPolicy
Why it's wrong here
A bucket policy controls access to the S3 bucket itself, not the permissions for S3 to invoke Lambda.
- ✗
AWS::Lambda::EventSourceMapping
Why it's wrong here
Event source mappings are used for streaming or poll-based sources like SQS, DynamoDB Streams, or Kinesis, not for S3 event notifications.
- ✗
AWS::IAM::Role
Why it's wrong here
An IAM role defines what actions the Lambda function can perform, not who can invoke it.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse the Lambda execution role (IAM::Role) with the invocation permission (Lambda::Permission), or mistakenly think S3 uses a bucket policy or event source mapping to trigger Lambda, when in fact S3 uses a push-based notification that requires a resource-based policy on the Lambda function.
Detailed technical explanation
How to think about this question
Under the hood, when S3 sends an event notification to Lambda, it uses a resource-based policy (the Lambda permission) that includes a Condition block with SourceArn and SourceAccount to prevent the confused deputy problem. This is critical because without these conditions, a malicious S3 bucket in another account could trick your Lambda into processing its events. In SAM, the AWS::Lambda::Permission is often auto-generated when you use the S3 event source in the template, but you can also define it explicitly to add conditions or cross-account access.
KKey Concepts to Remember
- AWS::Lambda::Permission
- Resource-based policy
- S3 event notification
- AWS SAM
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
AWS::Lambda::Permission
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.
Review aWS::Lambda::Permission, then practise related DVA-C02 questions on the same topic to reinforce the concept.
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FAQ
Questions learners often ask
What does this DVA-C02 question test?
Deployment — This question tests Deployment — AWS::Lambda::Permission.
What is the correct answer to this question?
The correct answer is: AWS::Lambda::Permission — AWS::Lambda::Permission is the correct resource because it explicitly grants the S3 service principal permission to invoke the Lambda function when an object is created. In AWS SAM, this resource is automatically generated when you define an S3 event source on a Lambda function, but if you need to declare it manually or override permissions, you use AWS::Lambda::Permission with a SourceArn pointing to the S3 bucket and a SourceAccount to prevent confused deputy attacks.
What should I do if I get this DVA-C02 question wrong?
Review aWS::Lambda::Permission, then practise related DVA-C02 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
AWS::Lambda::Permission
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Last reviewed: Jun 11, 2026
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