Microsoft Azure Solutions Architect Expert AZ-305 Practice Question
A financial-services company plans to migrate an on-premises risk-calculation engine to Azure. The solution runs only on Windows Server 2022 and needs 5-500 identical VM instances that must grow or shrink automatically according to CPU utilization. All instances must be patched by replacing them with the latest version of a single golden image, and they must be distributed across three availability zones to meet a 99.99 percent SLA while keeping administrative effort low. Which Azure service meets all the requirements?
Create an Availability Set of Windows Server 2022 VMs built from a managed image and configure Azure Automation runbooks to add or remove VMs.
Use Azure Batch with a custom Windows Server 2022 node image to run the workload and rely on built-in pool autoscaling.
Provision Windows Server 2022 VMs on Azure Dedicated Hosts distributed across zones and use Azure Functions to start and stop VMs on demand.
Deploy a Virtual Machine Scale Set that uses a versioned Windows Server 2022 image from an Azure Compute Gallery and spans three Availability Zones.
Virtual Machine Scale Sets (VMSS) let you deploy and manage a group of identical or near-identical VMs as a single resource. When you use zone-redundant VMSS with either Uniform or Flexible orchestration, the instances can be spread across multiple Availability Zones, which enables the 99.99 percent VM uptime SLA. VMSS also integrates with autoscale rules that add or remove instances based on performance metrics such as CPU utilization, eliminating manual effort. By storing a versioned Windows Server 2022 image in an Azure Compute Gallery (formerly Shared Image Gallery) and configuring the scale set to use that image, you can roll out OS and application updates simply by updating the image version and performing a rolling upgrade. Availability Sets (without scale sets) provide no built-in autoscale and only fault-domain redundancy. Dedicated hosts require more management and offer no native autoscale. Azure Batch supports autoscale but does not guarantee zone-level redundancy or the 99.99 percent VM SLA and is optimized for stateless batch, not long-running VM workloads.
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What is a Virtual Machine Scale Set (VMSS) in Azure?
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What are Availability Zones, and how do they contribute to the 99.99% SLA in Azure?
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Microsoft Azure Solutions Architect Expert AZ-305
Design infrastructure solutions
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