Microsoft Azure Solutions Architect Expert AZ-305 Practice Question
Your company is migrating a three-tier .NET application to Azure. The web and application tiers will run on eight Windows Server virtual machines (VMs).
Business requirements:
Achieve an SLA of at least 99.99% VM connectivity uptime.
Maintain service availability if any single Azure availability zone in the selected region becomes unavailable.
Minimize additional cost and administrative overhead.
Which deployment option for the web and application tiers should you recommend?
Use an Azure Virtual Machine Scale Set with a single placement group and set platformFaultDomainCount to 2.
Create an Azure Virtual Machine Scale Set configured for zone redundancy, distributing the eight VMs across at least two availability zones in the region.
Deploy two identical environments in separate Azure regions, each using availability sets, and route traffic with Azure Traffic Manager (priority routing).
Place all VMs in an Azure availability set with two fault domains and five update domains inside one availability zone.
Configuring an Azure Virtual Machine Scale Set (VMSS) for zone redundancy and deploying at least two instances across multiple availability zones provides a 99.99 percent virtual-machine connectivity SLA. Because the instances are automatically distributed across the specified zones (and balanced when zoneBalance is enabled), the workload continues to run even if one zone fails. This approach avoids the complexity and higher costs of maintaining duplicate regional deployments while delivering the required resiliency.
An availability set confined to a single zone is limited to a 99.95 percent SLA and does not protect against zonal failures. A single-placement-group VMSS that stays within one zone offers similar limitations. Deploying full environments in two regions behind Traffic Manager adds resiliency but introduces extra cost and operational overhead that the scenario seeks to avoid.
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What is zone redundancy in Azure Virtual Machine Scale Sets?
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Microsoft Azure Solutions Architect Expert AZ-305
Design business continuity solutions
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