You are deploying a cluster of virtual machines for a highly available application.

You need to decide between using an Availability Set or Availability Zones.

Which TWO statements accurately describe the differences and SLA implications of these options? (Select TWO)

Answer options:

Availability Zones protect against entire data center failures, while Availability Sets protect against localized hardware failures within a single data center.

Deploying VMs across two or more Availability Zones provides a 99.99% SLA.

Deploying VMs in an Availability Set provides a 99.99% SLA.

Availability Zones are available in every Azure region.

Availability Sets guarantee that VMs are placed in different physical buildings.

How to approach this question

Recall the SLA numbers (99.95% vs 99.99%) and the physical fault domain differences (racks vs data centers).

Full Answer

Availability Zones protect against entire data center failures, while Availability Sets protect against localized hardware failures within a single data center., Deploying VMs across two or more Availability Zones provides a 99.99% SLA.

Availability Sets distribute VMs across multiple fault domains (server racks) within a single data center, providing a 99.95% SLA. They protect against localized hardware failures (e.g., a rack losing power). Availability Zones distribute VMs across multiple distinct physical data centers within a region, providing a higher 99.99% SLA. They protect against the failure of an entire data center.

Common mistakes

Assuming Availability Sets provide 99.99% SLA, or assuming Availability Zones are supported in every single Azure region.

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