- A
Configure a VPC endpoint policy that allows only API Gateway.
Why wrong: VPC endpoint policies control access to the VPC endpoint, not Lambda invocation.
- B
Add a resource-based policy with 'aws:SourceAccount' condition.
Why wrong: This does not restrict to API Gateway; any entity in the account can invoke.
- C
Add a resource-based policy with 'aws:SourceVpce' condition set to the API Gateway VPC endpoint ID.
Why wrong: This condition is for VPC endpoints, not API Gateway.
- D
Add a resource-based policy with 'aws:SourceArn' condition set to the API Gateway ARN.
This restricts invocation to the specific API Gateway.
Question 705 of 1,616
Restrict Lambda Invocation to API Gateway Using Resource Policy
This DVA-C02 practice question tests your understanding of deployment. 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 deploying a serverless application using AWS SAM. The application includes an API Gateway endpoint and a Lambda function. The developer wants to ensure that the Lambda function can be invoked only by the API Gateway and not directly. Which configuration should be used?
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 with 'aws:SourceArn' condition set to the API Gateway ARN.
Option D is correct because adding a resource-based policy with an `aws:SourceArn` condition set to the API Gateway ARN ensures that the Lambda function can only be invoked by that specific API Gateway. This uses the AWS Identity and Access Management (IAM) condition key to restrict the `lambda:InvokeFunction` action based on the ARN of the invoking resource, preventing direct invocation from other sources like the AWS CLI or SDK.
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 a VPC endpoint policy that allows only API Gateway.
Why it's wrong here
VPC endpoint policies control access to the VPC endpoint, not Lambda invocation.
- ✗
Add a resource-based policy with 'aws:SourceAccount' condition.
Why it's wrong here
This does not restrict to API Gateway; any entity in the account can invoke.
- ✗
Add a resource-based policy with 'aws:SourceVpce' condition set to the API Gateway VPC endpoint ID.
Why it's wrong here
This condition is for VPC endpoints, not API Gateway.
- ✓
Add a resource-based policy with 'aws:SourceArn' condition set to the API Gateway ARN.
Why this is correct
This restricts invocation to the specific API Gateway.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse resource-based policies with VPC-based controls, often selecting `aws:SourceVpce` (Option C) thinking API Gateway invokes Lambda through a VPC endpoint, but API Gateway uses a public endpoint or private integration without a VPC endpoint for Lambda invocation.
Detailed technical explanation
How to think about this question
Under the hood, the `aws:SourceArn` condition key evaluates the ARN of the resource that makes the request, which for API Gateway is the ARN of the REST API or HTTP API (e.g., `arn:aws:execute-api:region:account-id:api-id/*/*`). This condition is evaluated at the time of invocation, and the ARN must match exactly, including the stage and method wildcards if used. A real-world scenario is when you have multiple APIs in the same account and need to ensure each Lambda is only triggered by its designated API, preventing cross-API invocation.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
Quick reference
Cloud Service Model Comparison
| Model | You Manage | Provider Manages | Examples |
|---|---|---|---|
| IaaS | OS, runtime, apps, data | Hardware, hypervisor, networking | EC2, Azure VMs, GCP Compute Engine |
| PaaS | Apps and data | OS, runtime, middleware, hardware | Elastic Beanstalk, Azure App Service |
| SaaS | Data and settings only | Everything else | Microsoft 365, Salesforce, Workday |
| FaaS / Serverless | Function code only | Infra, scaling, runtime | Lambda, Azure Functions, Cloud Run |
| CaaS | Containers and apps | Kubernetes, OS, hardware | EKS, AKS, GKE |
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?
Deployment — This question tests Deployment — 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 with 'aws:SourceArn' condition set to the API Gateway ARN. — Option D is correct because adding a resource-based policy with an `aws:SourceArn` condition set to the API Gateway ARN ensures that the Lambda function can only be invoked by that specific API Gateway. This uses the AWS Identity and Access Management (IAM) condition key to restrict the `lambda:InvokeFunction` action based on the ARN of the invoking resource, preventing direct invocation from other sources like the AWS CLI or SDK.
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
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