AZ-900 Describe Azure architecture and services Practice Question
Which Azure service provides a hybrid cloud solution that enables running Azure services in on-premises data centers?
⚠ Common exam trap
Many candidates confuse Azure Arc (which manages resources across environments) with Azure Stack (which actually runs Azure services on-premises), leading them to select Arc as the hybrid compute solution instead of the correct infrastructure extension.
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
✓
Azure Stack
Azure Stack is a hybrid cloud solution that extends Azure services and capabilities to on-premises environments. It allows organizations to run Azure compute, storage, and networking services in their own data centers, providing consistency with the public Azure cloud for workloads that require low latency, data residency, or offline operation.
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 ExpressRoute
Why it's wrong here
Azure ExpressRoute establishes a dedicated, private network connection between your on-premises infrastructure and Azure, bypassing the public internet for improved reliability, security, and performance. While this is a key enabler for hybrid networking, ExpressRoute does not provide Azure compute, storage, or application services to run on-premises. It only moves data between sites, so it cannot be the hybrid cloud platform described in the scenario.
- ✓
Azure Stack
Why this is correct
Azure Stack — specifically Azure Stack Hub — is a true hybrid cloud platform that extends Azure's core services (including IaaS and PaaS) into your own data center. It runs on certified hardware in your facility while staying operationally consistent with public Azure, enabling offline or edge scenarios with the same Azure portal, APIs, and tooling. This directly satisfies the requirement for a platform that brings Azure services and capabilities on-premises.
- ✗
Azure Arc
Why it's wrong here
Azure Arc is a management and governance service that lets you apply Azure control planes (such as Azure Policy, RBAC, and monitoring) to resources located outside Azure, including on-premises, edge, and multi-cloud environments. Arc does not run Azure services on-premises; instead, it brings Azure management to external resources from the cloud. Because the scenario calls for delivering Azure services locally rather than managing existing infrastructure remotely, Arc is not the correct choice.
- ✗
Azure Hybrid Benefit
Why it's wrong here
Azure Hybrid Benefit is a licensing optimization program that lets you reuse existing Windows Server and SQL Server licenses with active Software Assurance to pay reduced rates on Azure virtual machines. This lowers the cost of running workloads in Microsoft's cloud but does not introduce any Azure services or control plane into your local data center. Therefore, it is a financial tool, not a hybrid cloud platform for bringing Azure capabilities on-premises.
Go deeper
Related to this question
Learn chapter
Azure Regions and Geographies
Key term
Data residency
Data residency is the physical or geographical location where an organization's data is stored and processed, often subject to local laws.
Key term
Hybrid cloud
A hybrid cloud is a computing environment that combines a private cloud (on-premises infrastructure) with one or more public cloud services, allowing data and applications to be shared between them.
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