Microsoft Azure Solutions Architect Expert AZ-305 Practice Question
You are designing the compute layer for an ASP.NET Core web application that must remain online during any single-datacenter failure within the West Europe Azure region. The solution must achieve Microsoft's published 99.99 percent virtual-machine SLA while keeping infrastructure cost as low as possible. The application tier will run on two Windows Server virtual machines and must stay within the same region for compliance reasons.
Which deployment option should you recommend?
Enable Azure Site Recovery to replicate the virtual machines asynchronously to another Azure region and configure manual failover.
Deploy each virtual machine in the same Availability Zone but in separate proximity placement groups.
Create a Virtual Machine Scale Set that distributes at least two instances across two Availability Zones in West Europe.
Place the two virtual machines in an Availability Set that uses managed Standard SSD disks.
Microsoft provides a 99.99 percent virtual-machine SLA when two or more instances of the same VM are distributed across separate Availability Zones in the same region. A Virtual Machine Scale Set (VMSS) configured with zone distribution automatically places instances in different zones, handles balancing, and incurs no additional licensing cost beyond the individual VMs.
Placing the VMs in an Availability Set reaches only a 99.95 percent SLA because all instances stay in one datacenter. Creating two proximity placement groups in the same zone does not add fault isolation-they remain in a single zone and inherit that zone's 99.9 percent (single-instance) or 99.95 percent (availability-set) SLA. Azure Site Recovery replication to a secondary region improves disaster recovery but does not raise the intra-region availability SLA and cannot guarantee automatic failover without manual action.
Therefore, deploying the VMs as a Virtual Machine Scale Set that spans at least two Availability Zones within the West Europe region is the only option that meets the 99.99 percent intra-region availability requirement at the lowest cost.
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Microsoft Azure Solutions Architect Expert AZ-305
Design business continuity solutions
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