The answer is Azure Hybrid Connections, which is the correct choice because it enables secure access to on-premises resources without requiring any inbound firewall changes. This service, part of Azure App Service and Azure Relay, works by establishing an outbound-only tunnel from an on-premises Hybrid Connection Manager to Azure over port 443 using WebSockets and TLS, so traffic is relayed without opening inbound ports on your local network. On the AZ-900 exam, this tests your understanding of hybrid networking and secure connectivity options, often appearing as a scenario where you need to connect a cloud app to a legacy on-premises database without IT firewall approvals. A common trap is confusing this with VPN Gateway or ExpressRoute, which do require inbound rules or dedicated circuits. Remember the key: Azure Hybrid Connections uses an outbound-only relay, so no inbound firewall changes are ever needed—think "outbound tunnel, no inbound hassle."
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.
Which Azure service provides a hybrid connection solution for enabling applications to access on-premises resources without inbound firewall changes?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Azure Hybrid Connections
Azure Hybrid Connections (part of Azure App Service and Azure Relay) allows applications to securely connect to on-premises resources over port 443 using WebSockets and TLS, without requiring any inbound firewall rules or changes to the on-premises network. This is achieved by establishing an outbound-only tunnel from the on-premises Hybrid Connection Manager to Azure, which then relays traffic to the target resource.
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 VPN Gateway
Why it's wrong here
VPNGateway requires network-level configuration; Hybrid Connections work at the application level without changing firewalls.
✓
Azure Hybrid Connections
Why this is correct
Hybrid Connections enables app-to-on-premises connectivity via outbound connections, requiring no inbound firewall changes.
Related concept
Read the scenario before looking for a memorised answer.
✗
Azure Private Link
Why it's wrong here
Private Link provides private access to Azure services from a VNet; Hybrid Connections enables access to on-premises resources.
✗
Azure ExpressRoute
Why it's wrong here
ExpressRoute is a network-level private connection; Hybrid Connections operates at the application level.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Azure Hybrid Connections with Azure VPNGateway or ExpressRoute, assuming any hybrid solution requires inbound firewall changes, but Hybrid Connections uniquely uses an outbound-only relay over standard HTTPS ports.
Detailed technical explanation
How to think about this question
Under the hood, Azure Hybrid Connections use the Azure Relay service's Hybrid Connections feature, which relies on WebSocket connections initiated by the on-premises Hybrid Connection Manager (HCM) to the Azure Relay namespace. The HCM listens on a local port and forwards traffic from the Azure side to the on-premises resource, all over HTTPS (port 443), meaning no inbound ports need to be opened on the on-premises firewall. A real-world scenario is a web app in Azure App Service that needs to query an on-premises SQL Server database without exposing the database to the internet or modifying firewall rules.
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 Hybrid Connections — Azure Hybrid Connections (part of Azure App Service and Azure Relay) allows applications to securely connect to on-premises resources over port 443 using WebSockets and TLS, without requiring any inbound firewall rules or changes to the on-premises network. This is achieved by establishing an outbound-only tunnel from the on-premises Hybrid Connection Manager to Azure, which then relays traffic to the target resource.
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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Question Discussion
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