Exam AZ-900 topic 1 question 20 discussion

For all Virtual Machines that have TWO or more instances deployed across two or more Availability Zones in the same Azure region, we guarantee you will have Virtual Machine Connectivity to at least one instance at least 99.99% of the time. "SLA for Virtual Machines Last updated: July 2020", https://azure.microsoft.com/en-us/support/legal/sla/virtual-machines/v1_9/ That was cited in: https://docs.microsoft.com/en-us/azure/availability-zones/az-overview after ' With Availability Zones, Azure offers industry best 99.99% VM uptime SLA. '

Answer correct. SLA for Virtual Machines Last updated: July 2020 For all Virtual Machines that have two or more instances deployed across two or more Availability Zones in the same Azure region, we guarantee you will have Virtual Machine Connectivity to at least one instance at least 99.99% of the time. For all Virtual Machines that have two or more instances deployed in the same Availability Set or in the same Dedicated Host Group, we guarantee you will have Virtual Machine Connectivity to at least one instance at least 99.95% of the time. For any Single Instance Virtual Machine using Premium SSD or Ultra Disk for all Operating System Disks and Data Disks, we guarantee you will have Virtual Machine Connectivity of at least 99.9%. For any Single Instance Virtual Machine using Standard SSD Managed Disks for Operating System Disk and Data Disks, we guarantee you will have Virtual Machine Connectivity of at least 99.5%. For any Single Instance Virtual Machine using Standard HDD Managed Disks for Operating System Disks and Data Disks, we guarantee you will have Virtual Machine Connectivity of at least 95%.

A single VM make this answer wrong

B. No The solution does not meet the goal. To achieve a guaranteed availability of 99.99% in Azure, you need to deploy the virtual machines across at least two availability zones. Using only one availability zone means that if there is an issue in that zone, both virtual machines could be affected, leading to downtime and not meeting the 99.99% availability requirement. Azure provides 99.99% availability for virtual machines only when they are distributed across two or more availability zones, ensuring redundancy and failover capabilities. Therefore, the proposed strategy with two VMs in a single availability zone would not be sufficient.

SLA for Virtual Machines Last updated: July 2020 For all Virtual Machines that have two or more instances deployed across two or more Availability Zones in the same Azure region, we guarantee you will have Virtual Machine Connectivity to at least one instance at least 99.99% of the time. For all Virtual Machines that have two or more instances deployed in the same Availability Set or in the same Dedicated Host Group, we guarantee you will have Virtual Machine Connectivity to at least one instance at least 99.95% of the time. For any Single Instance Virtual Machine using Premium SSD or Ultra Disk for all Operating System Disks and Data Disks, we guarantee you will have Virtual Machine Connectivity of at least 99.9%. For any Single Instance Virtual Machine using Standard SSD Managed Disks for Operating System Disk and Data Disks, we guarantee you will have Virtual Machine Connectivity of at least 99.5%. For any Single Instance Virtual Machine using Standard HDD Managed Disks for Operating System Disks and Data Disks, we guarantee you will have Virtual Machine Connectivity of at least 95%. Answer correct.

chat gpt : Including one virtual machine and two availability zones does not meet the goal of guaranteeing 99.99 percent availability. To achieve 99.99% availability in Azure, you typically need to deploy at least two virtual machines across two or more availability zones. This ensures that if one zone goes down, the application can continue running in the other zone, providing the required high availability. A single virtual machine cannot provide this level of availability by itself.

2 VM on +2 AZ = 99.99% 2 VM on 1 AZ = 99.95%

The answer seems to be B. No Deploying one virtual machine and two availability zones does not meet the goal of achieving a guaranteed availability of 99.99 percent. To achieve such a high level of availability, you typically need to distribute your application across multiple instances in multiple availability zones or sets.

+2 VM on +2 AZ = 99.99% +2 VM on 1 AZ = 99.95%

What is "LOB"?

You need at least 2 VM in 2 different AZ. With a single VM having multiple AZ has no effect, because (of course?) VM cannot spans AZs

Answer is NO For any Single Instance Virtual Machine using Premium SSD or Ultra Disk for all Operating System Disks and Data Disks, we guarantee you will have Virtual Machine Connectivity of at least 99.9%. refer : https://www.azure.cn/en-us/support/sla/virtual-machines/index.html

B is the correct answer

you need at least 2 vms along with the 2 zones for this percentage up uptime

B. No - You will need a minimum of two VMs across two availability zones to reach 99.99 %

https://azure.microsoft.com/en-us/support/legal/sla/virtual-machines/v1_9/ For any Single Instance Virtual Machine using Premium SSD, Ultra Disk or Premium SSD v2 for all Operating System Disks and Data Disks, we guarantee you will have Virtual Machine Connectivity of at least 99.9%. CONCLUSSION: For a single VM instance you only have to see the disk, not availability zones.

B definetly