Microsoft Azure Solutions Architect Expert AZ-305 Practice Question
Your company runs a stateless .NET Core API on two Standard_D2s_v4 virtual machines in Azure region West Europe. Management requires a 99.99 percent virtual machine connectivity SLA without deploying to a second region. The solution must minimize additional licensing and infrastructure costs and must support automatic OS image updates in the future. Which design should you recommend?
Upgrade to a single larger virtual machine with Premium SSDs and enable Azure Site Recovery to replicate the VM to the North Europe region.
Migrate the API to an Azure App Service plan, run two instances in West Europe, and rely on the service's built-in load balancing.
Place the two existing virtual machines in an Availability Set and configure a Standard Load Balancer in front of them.
Redeploy the API to an Azure Virtual Machine Scale Set that spans at least two Availability Zones in West Europe and front it with an Azure Standard Load Balancer.
Azure guarantees a 99.99 percent virtual-machine connectivity SLA only when at least two instances of the same workload are deployed across two or more Availability Zones in a single region and placed behind a load-balancing service. Deploying the API in a zonal or zone-redundant Virtual Machine Scale Set (VMSS) distributes instances across zones automatically, provides built-in support for rolling OS image upgrades, and avoids additional licensing costs because it continues to use the existing VM images.
Placing the current VMs in an Availability Set would raise availability to 99.95 percent only. Running multiple App Service instances in one region attains 99.95 percent but not 99.99 percent, and moving to PaaS may incur additional licensing costs. A single larger VM with Azure Site Recovery does not improve the primary region's SLA and still presents a single point of failure. Therefore, a zone-redundant VMSS with a Standard Load Balancer best meets the 99.99 percent requirement while enabling automated OS updates and controlling costs.
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Microsoft Azure Solutions Architect Expert AZ-305
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