Microsoft Certified Azure Fundamentals · Free Practice Question Medium
Question 53
In the context of Azure's Service Level Agreement (SLA) for virtual machines, which of the following deployment strategies would offer the highest level of availability?
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A
Deploying two or more virtual machines across different availability zones within the same region.
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B
Deploying two or more virtual machines within an availability set.
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C
Deploying two or more virtual machines within the same data center.
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D
Deploying a single virtual machine.
Reveal correct answer
Correct answer: A
Explanation
The correct answer is "Deploying two or more virtual machines across different availability zones within the same region".
Service Level Agreement (SLA) is a commitment by a service provider on the level of service - like uptime, performance, or other key metrics - that users can expect. Azure provides an SLA for various services, including Virtual Machines.
A single VM, even with premium storage, provides a lesser SLA compared to VMs deployed in an Availability Set or across Availability Zones. While using an Availability Set (two or more VMs in the same datacenter but across fault and update domains) provides a higher SLA than a single VM, the highest SLA is provided when two or more VMs are deployed across Availability Zones in the same region.
Availability Zones are unique physical locations within a region. Each zone is made up of one or more datacenters equipped with independent power, cooling, and networking. They are set up to be an isolation boundary - if one zone goes down, the other continues working. This distribution of VMs across zones provides high availability and resiliency, hence offering the highest SLA.
See: https://azure.microsoft.com/en-us/support/legal/sla/virtual-machines/v1_9/
Discussion
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