Microsoft Azure Solutions Architect Expert AZ-305 Practice Question
Your company runs a mission-critical web tier on two Windows Server virtual machines in a single Azure region. You must redesign the deployment to meet the following requirements:
Remain available if any one availability zone in the region fails.
Allow rolling operating-system image upgrades without application downtime.
Minimize additional licensing or platform costs.
Which solution should you implement?
Create an Azure Virtual Machine Scale Set with at least two instances distributed across multiple availability zones and front it with a Standard Load Balancer.
Place the virtual machines in a single Availability Set configured with two fault domains and use a Basic Load Balancer.
Deploy identical virtual machines in separate resource groups and use Azure Traffic Manager with Priority routing to direct traffic between them.
Enable Azure Site Recovery to replicate the virtual machines to the paired region and perform manual failover when necessary.
Deploying the workload as an Azure Virtual Machine Scale Set (VMSS) that spans two or more availability zones and is front-ended by a Standard Load Balancer meets all stated requirements. Distributing VM instances across multiple zones ensures the service continues if a single zone goes offline and qualifies for the 99.99 percent VM SLA in one region. VM scale sets support rolling OS image upgrades, so one instance can be updated while others keep the service running. Because the VMs remain Windows Server instances running under the same licenses (and can still use Azure Hybrid Benefit, if applicable), no additional licensing cost is introduced.
Placing VMs in an availability set provides only 99.95 percent SLA and does not protect against zone failure. Using Traffic Manager with two standalone VMs in the same region does not give zone redundancy or managed rolling upgrades. Relying on Azure Site Recovery to a paired region protects against regional disasters but introduces failover delays and does not guarantee zero downtime within the primary region.
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What is an Azure Virtual Machine Scale Set (VMSS) and how does it work?
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What is the difference between a Basic Load Balancer and a Standard Load Balancer in Azure?
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What is Azure's 99.99 percent virtual machine compute SLA, and how is it achieved?
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Microsoft Azure Solutions Architect Expert AZ-305
Design business continuity solutions
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