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You plan to deploy several Azure virtual machines.
You need to ensure that the services running on the virtual machines are available if a single data center fails.
Solution: You deploy the virtual machines to two or more scale sets.
Does this meet the goal?
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A. B.B
This answer does not specify that the scale set will be configured across multiple data centers so this solution does not meet the goal.
Azure virtual machine scale sets let you create and manage a group of load balanced VMs. The number of VM instances can automatically increase or decrease in response to demand or a defined schedule. Scale sets provide high availability to your applications, and allow you to centrally manage, configure, and update many VMs.
Virtual machines in a scale set can be deployed across multiple update domains and fault domains to maximize availability and resilience to outages due to data center outages, and planned or unplanned maintenance events.
https://docs.microsoft.com/en-us/azure/virtual-machine-scale-sets/availabilityYes, the solution of deploying virtual machines to two or more scale sets meets the goal of ensuring that services running on the virtual machines are available if a single data center fails.
Azure Scale Sets allow you to deploy and manage a group of identical, load-balanced virtual machines. By deploying virtual machines to multiple scale sets, you can distribute the virtual machines across multiple fault and update domains within an Azure region. This means that if a single data center or a single scale set fails, the services running on the virtual machines in other scale sets or data centers remain available.
Therefore, deploying virtual machines to two or more scale sets ensures high availability and fault tolerance of services running on those virtual machines.