Exam AZ-900 topic 1 question 122 discussion

An availability set is a logical grouping of VMs within a datacenter. You will have to use availability zones. Hence B answer.

answer is "No / B". Virtual Machine Scale Sets let you create and manage a group of identical, load balanced VMs. The number of VM instances can automatically increase or decrease in response to demand or a defined schedule. What provide Data Center fault tolerant, is "Availability Set".

No is the answer. You have to use availability zones.

B. No Deploying virtual machines to two or more scale sets alone does not guarantee high availability across data centers

I'll go with No. To protect your Virtual Machine Scale Sets from datacenter-level failures, you can create a scale set across Availability Zones, they did not mentioned this, they mentioned to deploy the VMs to more than one scale set instead. According to the benefits of Azure Scale Sets: "Provides high availability and application resiliency by distributing VMs across availability zones or fault domains" "For more availability, you can use Availability Zones to automatically distribute VM instances in a scale set within a single datacenter or across multiple datacenters" https://learn.microsoft.com/en-us/azure/virtual-machine-scale-sets/overview

- Scale sets: Scale sets are a feature in Azure that allows you to create and manage a group of identical, load balanced VMs. Scale sets provide high availability and auto-scale capabilities, and they are an effective way to ensure that your services are always available and running optimally. - Availability sets: Availability sets are a feature in Azure that helps ensure the availability of your virtual machines (VMs) by distributing them across multiple physical servers, switches, and storage units. When you create an availability set, you can specify the number of VMs that you want in the set, and Azure will automatically distribute them across multiple physical resources to ensure that they are available in the event of a failure. Availability sets are designed to provide 99.95% uptime for two or more VMs in the same availability set, which means that your VMs are expected to be available at least 99.95% of the time. The answer is B.

B. No is correct

Option B

the last one should be yes? azure does cross region replication pairing for all geographies https://docs.microsoft.com/en-us/azure/availability-zones/cross-region-replication-azure

Even through you can deploy VM scale set to multiple zones to accommodate for DC failures, such setup is not by default just like it is not by default for VMs. Based on the information provided in the question, answer is B.

Availability Zone provides high availability in case of a Data center failure and not Scale set.

Availability Sets— Provides resiliency against machine failure. Availability Zone - Provides resiliency against data center failure. Virtual Machine Scale Sets - Group of identical machine under a load balancer. It is basically auto-scaling and doesn't provide protection against datacenter failure. Hence, the answer is "B".

Question repeating I could see

Is this true on real exam "After you answer a question in this section, you will NOT be able to return to it. As a result, these questions will not appear in the review screen."? Once you answered you cannot return to change the answer to this question?

B is correct answer

No ==> Scale sets refer to a group of VMs within a datacenter therefore it cannot address a datacenter failure.

Availability Zone is the best sol.