- A
Attach a security group to the API Gateway.
Why wrong: API Gateway does not support security groups.
- B
Create a VPC endpoint for API Gateway and associate it with the API.
Why wrong: VPC endpoints are used for private access but do not restrict access by themselves; resource policy is needed.
- C
Enable private DNS on the API Gateway API.
Why wrong: Private DNS is for VPC endpoints, not for restricting access to a VPC.
- D
Configure a resource policy with a condition using aws:SourceVpc.
Resource policies with aws:SourceVpc condition allow access only from specified VPCs.
Question 606 of 1,616
Restrict API Gateway to VPC
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 building a serverless application using API Gateway and Lambda. The API Gateway REST API endpoint needs to be accessible only from a specific VPC. 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
✓
Configure a resource policy with a condition using aws:SourceVpc.
Option D is correct because API Gateway resource policies support the `aws:SourceVpc` condition key, which restricts access to requests originating from a specific VPC. This is the native way to control VPC-based access to a REST API without requiring a VPC endpoint or security groups, as API Gateway operates outside the VPC network boundary.
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.
- ✗
Attach a security group to the API Gateway.
Why it's wrong here
API Gateway does not support security groups.
- ✗
Create a VPC endpoint for API Gateway and associate it with the API.
Why it's wrong here
VPC endpoints are used for private access but do not restrict access by themselves; resource policy is needed.
- ✗
Enable private DNS on the API Gateway API.
Why it's wrong here
Private DNS is for VPC endpoints, not for restricting access to a VPC.
- ✓
Configure a resource policy with a condition using aws:SourceVpc.
Why this is correct
Resource policies with aws:SourceVpc condition allow access only from specified VPCs.
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 VPC endpoints (which provide private connectivity) with access control mechanisms, assuming that creating a VPC endpoint alone restricts access to the VPC, when in fact it only enables private routing and must be paired with a resource policy or security group to enforce the restriction.
Detailed technical explanation
How to think about this question
The `aws:SourceVpc` condition key in an API Gateway resource policy evaluates the VPC ID from which the request originates, using the source IP address mapped to the VPC's CIDR range. This works because API Gateway receives the original client IP in the `X-Forwarded-For` header, and AWS can infer the VPC ID for traffic coming through a VPC endpoint or a VPN/Direct Connect. A common real-world scenario is a microservice architecture where an internal API must be consumed only by services within a corporate VPC, and using `aws:SourceVpc` avoids the complexity of managing IP whitelists that may change.
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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Development with AWS Services — study guide chapter
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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 a resource policy with a condition using aws:SourceVpc. — Option D is correct because API Gateway resource policies support the `aws:SourceVpc` condition key, which restricts access to requests originating from a specific VPC. This is the native way to control VPC-based access to a REST API without requiring a VPC endpoint or security groups, as API Gateway operates outside the VPC network boundary.
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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