The answer is the Azure Functions Premium plan with VNet integration. This is correct because the Premium plan supports virtual network (VNet) integration, enabling your serverless function code to securely access resources inside a connected on-premises network—such as an SQL Server database—over a site-to-site VPN, all without exposing the database to the public internet. On the Microsoft Azure Fundamentals AZ-900 exam, this scenario tests your understanding of how different Azure Functions plans handle networking; a common trap is assuming the Consumption plan works for private network access, but it lacks VNet integration entirely. Remember that the Premium plan is the only serverless compute option that can reach on-premises databases through a VPN tunnel. A helpful memory tip: “Premium for private pathways”—if you need to connect to a resource behind a VPN, you need the Premium plan.
AZ-900 Describe Azure architecture and services Practice Question
This AZ-900 practice question tests your understanding of describe azure architecture and services. 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 developer is building a serverless application that requires integration with an on-premises SQL Server database for real-time data processing. The on-premises network is connected to Azure via a site-to-site VPN. Which Azure service would allow the function to securely access the on-premises database without exposing it to the public internet?
Why wrong: Consumption plan functions cannot access resources in a VNet; they require Premium plan for VNet integration.
B
Azure Functions in Premium plan with VNet integration
Premium plan allows VNet integration, enabling secure access to on-premises resources over the VPN.
C
Azure SQL Database
Why wrong: The question is about accessing an on-premises SQL Server, not migrating to Azure SQL Database.
D
Hybrid Connections
Why wrong: Hybrid Connections are typically for connecting Azure App Service to on-premises resources, not directly for Functions; also they rely on a relay agent.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Azure Functions in Premium plan with VNet integration
Option B is correct because Azure Functions in the Premium plan supports VNet integration, allowing the function to securely access resources in a connected on-premises network via a site-to-site VPN without exposing the database to the public internet. The Consumption plan lacks VNet integration, and Azure SQL Database is a PaaS service, not a compute service for running serverless code.
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.
✗
Azure Functions in Consumption plan
Why it's wrong here
Consumption plan functions cannot access resources in a VNet; they require Premium plan for VNet integration.
✓
Azure Functions in Premium plan with VNet integration
Why this is correct
Premium plan allows VNet integration, enabling secure access to on-premises resources over the VPN.
Related concept
Read the scenario before looking for a memorised answer.
✗
Azure SQL Database
Why it's wrong here
The question is about accessing an on-premises SQL Server, not migrating to Azure SQL Database.
✗
Hybrid Connections
Why it's wrong here
Hybrid Connections are typically for connecting Azure App Service to on-premises resources, not directly for Functions; also they rely on a relay agent.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume Azure Functions in any plan can access on-premises resources via VPN, but only the Premium and Dedicated plans support VNet integration, while the Consumption plan is restricted to public endpoints.
Detailed technical explanation
How to think about this question
Azure Functions Premium plan VNet integration uses a delegated subnet in the same virtual network as the VPNgateway, enabling the function app to route traffic to on-premises resources via the site-to-site VPN tunnel. This integration leverages the Azure Virtual Network service endpoints and requires the function app to be in the Premium or Dedicated (App Service) plan, as the Consumption plan runs in a multi-tenant environment without direct VNet access. In real-world scenarios, this setup is critical for hybrid cloud applications that need low-latency, secure access to on-premises data without opening firewall ports.
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-900 question in full detail.
Describe Azure architecture and services — This question tests Describe Azure architecture and services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Azure Functions in Premium plan with VNet integration — Option B is correct because Azure Functions in the Premium plan supports VNet integration, allowing the function to securely access resources in a connected on-premises network via a site-to-site VPN without exposing the database to the public internet. The Consumption plan lacks VNet integration, and Azure SQL Database is a PaaS service, not a compute service for running serverless code.
What should I do if I get this AZ-900 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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