AZ-900 Azure Services and Architecture Questions
The largest slice of the exam. You need to recognise what each core service is for — not how to configure it, but which one you would reach for in a given scenario.
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What to know for this section
Architecture building blocks
A region is a set of datacentres in one geography. Availability zones are physically separate locations inside a region, so a zone-redundant deployment survives one datacentre failing. Resource groups are logical containers for lifecycle management, and Azure Resource Manager is the deployment and management layer everything goes through.
Compute choices
Virtual machines when you need control of the OS. App Service for web apps you would rather not patch. Azure Functions for short, event-driven code billed per execution. Container Instances and Kubernetes Service when the unit of deployment is a container. Virtual Desktop when users need a Windows desktop delivered from Azure.
Storage tiers
Blob storage for unstructured objects, with hot, cool and archive tiers trading retrieval speed and cost. Disk storage for VM drives. File storage for SMB shares that several machines mount at once. Archive is the cheapest and the slowest — retrieval takes hours, not milliseconds.