The answer is Regional VNet integration. This feature is the correct choice because it allows an Azure App Service app to make outbound calls to resources inside a virtual network by injecting the app’s traffic into a delegated subnet, enabling secure access to private APIs without exposing them to the public internet. On the Microsoft Azure Developer Associate AZ-204 exam, this scenario tests your understanding of hybrid connectivity and network isolation, often appearing as a distractor against Service Endpoints or Private Endpoints—remember that Regional VNet integration handles outbound traffic from the app, while Private Endpoints handle inbound traffic to the app. A common trap is confusing it with Gateway-required VNet integration, which is legacy and used for on-premises connections. Memory tip: think “Regional for outbound reach, Private for inbound breach.”
AZ-204 Develop Azure compute solutions Practice Question
This AZ-204 practice question tests your understanding of develop azure compute solutions. 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. 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 IoT command API runs in Azure App Service and must call a private API hosted inside a virtual network. Which feature allows outbound access from the app to the VNet?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Regional VNet integration
Regional VNet integration enables an Azure App Service app to make outbound calls to resources in a virtual network (VNet) using the app's outbound IP addresses. It works by injecting the app's outbound traffic into the VNet via a delegated subnet, allowing the app to reach private APIs hosted inside the VNet without exposing them to the public internet.
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.
✓
Regional VNet integration
Why this is correct
Regional VNet integration enables App Service outbound connectivity to resources in a virtual network.
Related concept
Read the scenario before looking for a memorised answer.
✗
Azure CDN custom domain
Why it's wrong here
CDN accelerates content delivery and does not provide VNet connectivity.
✗
Application Gateway path routing
Why it's wrong here
Application Gateway routes inbound traffic and does not give the app outbound VNet access.
✗
Private Endpoint for the web app only
Why it's wrong here
A Private Endpoint provides private inbound access to the web app, not outbound connectivity from it.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Private Endpoint (inbound) with VNet integration (outbound), mistakenly thinking a Private Endpoint on the app allows it to call VNet resources, when in fact it only allows VNet resources to call the app.
Detailed technical explanation
How to think about this question
Regional VNet integration uses a delegated subnet in the VNet and creates a network interface in the App Service plan's scale unit to route outbound traffic. The app's outbound calls use the same IP addresses as the subnet, and DNS resolution for private endpoints or custom DNS servers in the VNet is supported. This feature is essential for scenarios like an IoT command API that needs to securely call a backend database or microservice hosted in a VNet without traversing the public internet.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-204 question in full detail.
Develop Azure compute solutions — This question tests Develop Azure compute solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Regional VNet integration — Regional VNet integration enables an Azure App Service app to make outbound calls to resources in a virtual network (VNet) using the app's outbound IP addresses. It works by injecting the app's outbound traffic into the VNet via a delegated subnet, allowing the app to reach private APIs hosted inside the VNet without exposing them to the public internet.
What should I do if I get this AZ-204 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.
About these practice questions
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Variation 1. A image resize worker runs in Azure App Service and must call a private API hosted inside a virtual network. Which feature allows outbound access from the app to the VNet?
medium
✓ A.Regional VNet integration
B.Azure CDN custom domain
C.Application Gateway path routing
D.Private Endpoint for the web app only
Why A: Regional VNet integration enables an Azure App Service app to make outbound calls to resources in a virtual network (VNet) over the Microsoft backbone network. It uses a delegated subnet in the VNet to assign the app a network interface in the VNet, allowing it to reach private APIs without exposing them to the public internet.
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Question Discussion
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