AZ-104 – Question 102

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You have an app named App1 that runs on two Azure virtual machines named VM1 and VM2.
You plan to implement an Azure Availability Set for App1. The solution must ensure that App1 is available during planned maintenance of the hardware hosting
VM1 and VM2.
What should you include in the Availability Set?

  • A. one update domain
  • B. two fault domains
  • C. one fault domain
  • D. two update domains 

Correct Answer: D 
Microsoft updates, which Microsoft refers to as planned maintenance events, sometimes require that VMs be rebooted to complete the update. To reduce the impact on VMs, the Azure fabric is divided into update domains to ensure that not all VMs are rebooted at the same time.
Incorrect Answers:
A: An update domain is a group of VMs and underlying physical hardware that can be rebooted at the same time.
B, C: A fault domain shares common storage as well as a common power source and network switch. It is used to protect against unplanned system failure.

References:
https://petri.com/understanding-azure-availability-sets 
https://docs.microsoft.com/en-us/azure/virtual-machines/windows/tutorial-availability-sets 

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