Exam AZ-900 topic 1 question 19 discussion

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.

Answer is NO 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.

to ensure 99.99 SLA you need 2 VMs in 2 availability zones

No, the solution does not meet the goal of guaranteeing an availability of 99.99 percent. In Azure, achieving a Service Level Agreement (SLA) of 99.99 percent availability for virtual machines typically requires deploying them across at least two availability zones. This is because availability zones are designed to provide high availability by isolating resources in separate physical locations within a region, protecting against zone-level failures. If you only include one availability zone, the virtual machines would be susceptible to outages that affect that zone, thereby compromising the availability guarantee. To meet the 99.99 percent availability requirement, you should deploy at least two virtual machines across two different availability zones. This configuration ensures that if one zone experiences an issue, the other zone can continue to operate, thus maintaining the required level of availability for the critical line-of-business application.

the given solution only uses one Availability Zone, it does not meet the 99.99% availability requirement. The correct approach is to deploy the VMs across at least two Availability Zones.

b-no are physically separated zones within an Azure region. Availability zones guarantee virtual machine connectivity to at least one instance at least 99.99% of the time when you have two or more instances deployed across two or more Availability Zones in the same Azure region. Overview of virtual machines in Azure - Azure Virtual Machines | Microsoft Learn

To achieve a 99.99% availability SLA in Azure, you need to deploy two virtual machines in separate availability zones within the same region

B. No Availability Zones in Azure provide high availability by distributing resources across physically separate locations within an Azure region. To achieve a guaranteed availability of 99.99%, you typically need to leverage more than one Availability Zone. Including just one Availability Zone does not provide the redundancy required to ensure 99.99% availability, as a single Availability Zone can still be a single point of failure. A more appropriate strategy would be to use two virtual machines spread across two different Availability Zones. This way, if one Availability Zone goes down, the other can still ensure the availability of the application, thus meeting the 99.99% availability requirement. So, including two virtual machines but only one availability zone does not meet the goal.

Avaiability zones are meant to provide resilience - devices from different availability zones are physically seperate over large distnaces - this ensures security. Having only one availability zone provides no resilience at all.

Agree with the given answer

The proposed solution does not meet the goal of achieving a guaranteed availability of 99.99 percent. Let me explain why: Virtual Machines (VMs): Including two virtual machines is a good step for redundancy and fault tolerance. However, it’s not sufficient on its own to achieve the desired availability. VMs can still experience downtime due to maintenance, failures, or other issues. Availability Zones: The inclusion of one availability zone is a positive move, but it’s not enough to meet the stringent availability requirement. Availability zones provide isolation from data center failures within a region, but for 99.99 percent availability, we need more redundancy.

Answer is no because you need at least 2 VMS and 2 Availability zones

B

The answer is B. No The solution does not meet the goal. Azure's SLA for Virtual Machines with a single instance is 99.5% availability. To achieve a guaranteed availability of 99.99%, you would need to deploy the application in an architecture that takes advantage of Azure's higher availability options, such as Availability Zones. For an SLA of 99.99%, deploying the application in at least two Availability Zones would be recommended. This would ensure that your application is highly available across separate physical locations, each with its own power, cooling, and networking, reducing the risk of a single point of failure. Simply deploying two virtual machines in a single Availability Zone would not achieve the desired level of availability.

Here is a better link for this info: https://www.azure.cn/en-us/support/sla/virtual-machines/

two or more instances in two or more availability zones in the same azure region is 99.99% two or more instances in the same availability set is 99.95%

You need at least 2 virtual machines and 2 availability zone