Microsoft Azure Solutions Architect Expert AZ-305 Practice Question
Your company hosts 15 Windows Server and Linux virtual machines on an on-premises VMware cluster and 10 Azure virtual machines in the East US region. Management requires a disaster-recovery strategy that lets you fail over all workloads to Azure or to another Azure region if either the on-premises site or the primary region becomes unavailable. The recovery point objective must not exceed 15 minutes and the recovery time objective must be under two hours. Which solution should you recommend?
Use Azure Site Recovery to replicate the on-premises VMware VMs to Azure and configure Azure-to-Azure replication of the East US VMs to a paired region.
Deploy the VMs in availability sets that span availability zones and use Azure Traffic Manager to redirect users to secondary endpoints.
Enable Azure Backup with geo-redundant storage for all VMs and restore them in the target region during a disaster.
Create a Recovery Services vault, run daily backups for on-premises VMs and weekly backups for Azure VMs, and restore when required.
Azure Site Recovery (ASR) supports on-premises VMware replication to Azure with a minimum replication interval of 5 minutes and Azure-to-Azure VM replication with an interval of 5 minutes. These settings let you create recovery plans and meet a 15-minute RPO and a two-hour RTO. Azure Backup, even with geo-redundant storage, is designed mainly for long-term retention and generally provides daily recovery points, so it cannot guarantee a 15-minute RPO and has longer restore times. Availability sets protect only against host failures within a single datacenter and do not span regions, and Traffic Manager alone does not provide VM-level replication. Staggered daily or weekly backups likewise fail both the stated RPO and RTO requirements. Therefore, using Azure Site Recovery for both on-premises-to-Azure and Azure-to-Azure replication is the only option that satisfies the organization's recovery objectives.
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Microsoft Azure Solutions Architect Expert AZ-305
Design business continuity solutions
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