Microsoft Azure Solutions Architect Expert AZ-305 Practice Question
You manage three Windows Server 2022 virtual machines that run a line-of-business application in the East US region. Management mandates a disaster-recovery strategy that meets the following objectives:
Recovery Point Objective (RPO): 30 minutes or less
Recovery Time Objective (RTO): 2 hours or less
Fail over to the West US region if East US becomes unavailable
Minimize ongoing administrative effort and infrastructure changes
Which solution should you implement to meet these requirements?
Configure Azure Backup with daily VM backups stored in geo-redundant storage and perform restores in West US when needed.
Convert the VMs to a virtual machine scale set spread across availability zones within East US only.
Enable Azure Site Recovery to replicate the virtual machines to West US and create a recovery plan for planned and unplanned failover.
Copy the web application files to geo-redundant Azure Storage and use Azure Traffic Manager for regional routing.
Enabling Azure Site Recovery (ASR) to replicate the existing virtual machines asynchronously to a secondary region meets the stated objectives. ASR continuously replicates VM data and generates crash-consistent recovery points every 15 minutes by default-well within the 30-minute RPO requirement. It orchestrates both planned and unplanned failover and typically completes failover operations within minutes, satisfying the 2-hour RTO. Because ASR is configured entirely from the Azure portal, it requires no application refactoring or additional on-premises infrastructure.
Azure Backup with daily snapshots cannot meet a 30-minute RPO. A scale set spread only across availability zones remains in a single region and therefore does not provide regional disaster recovery. Replicating web files with geo-redundant storage and using Azure Traffic Manager does not replicate the virtual machines that run the application and cannot guarantee the required RPO or RTO.
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Microsoft Azure Solutions Architect Expert AZ-305
Design business continuity solutions
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