AZ-104 Question #279: Real Exam Question with Answer & Explanation

Question

You plan to move a distributed on-premises app named App1 to an Azure subscription. After the planned move, App1 will be hosted on several Azure virtual machines. You need to ensure that App1 always runs on at least eight virtual machines during planned Azure maintenance. What should you create?

Options

• Aone virtual machine scale set that has 10 virtual machines instances
• Bone Availability Set that has three fault domains and one update domain
• Cone Availability Set that has 10 update domains and one fault domain
• Done virtual machine scale set that has 12 virtual machines instances

Explanation

VM Scale Set consists of a set of identically configured VMs. Availability Set consists of a set of discrete VMs. No more than 20% of the Scale Set upgrading at any time, then 2 machines out of 10 will have maintenance, the 8 remaining VMs will be up. Virtual machine scale sets are created with five fault domains by default in Azure regions with no zones. For the regions that support zonal deployment of virtual machine scale sets and this option is selected, the default value of the fault domain count is 1 for each of the zones. FD=1 in this case implies that the VM instances belonging to the scale set will be spread across many racks on a best effort basis. https://docs.microsoft.com/en-us/azure/virtual-machines/manage-availability https://docs.microsoft.com/en-us/learn/modules/build-app-with-scale-sets/2-features-benefits- virtual-machine-scale-sets https://docs.microsoft.com/en-us/azure/virtual-machine-scale-sets/virtual-machine-scale-sets- automatic-upgrade

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