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Difficulty: MediumConfigure VMs for High Availability

Aether Financial plans to deploy a new transaction application in the Australia East region. The application will run on two virtual machines named VM-Tx1 and VM-Tx2. The application architecture must meet the following requirements:

- Protect the virtual machines from datacenter-wide failures.
- Guarantee a virtual machine SLA of at least 99.99%99.99\%.

Which two options should you select to meet the requirements? (Select two.)

  1. Deploy VM-Tx1 in Availability Zone 11 and VM-Tx2 in Availability Zone 22.Answer
  2. Configure a Standard SKU Load Balancer to distribute traffic across the virtual machines.Answer
  3. C
    Deploy both virtual machines in a single Availability Set configured with 33 fault domains.
  4. D
    Associate both virtual machines with a Basic SKU Load Balancer to route traffic across the zones.

Answer

Deploy the virtual machines in separate Availability Zones and configure a Standard SKU Load Balancer to distribute traffic across them.
To satisfy the requirements of protecting the virtual machines from datacenter-wide failures and achieving a 99.99%99.99\% SLA, you must deploy the virtual machines across different Availability Zones. Furthermore, because the virtual machines reside in different Availability Zones, a Standard SKU Load Balancer must be configured to distribute incoming traffic, as a Basic SKU Load Balancer does not support routing to backend resources across multiple zones.

Step-by-Step Solution

1
Analyze the high availability and SLA constraints.
The requirements dictate protection against datacenter-wide failures and a minimum virtual machine SLA of 99.99%99.99\%.
Availability Zones provide 99.99%99.99\% SLA by isolating virtual machines in physically separate datacenters within a region, whereas Availability Sets only protect against failures inside a single datacenter (99.95%99.95\% SLA).
2
Select the correct deployment model for the virtual machines.
VM-Tx1 must be deployed in one Availability Zone (such as Zone 11) and VM-Tx2 in another Availability Zone (such as Zone 22).
Distributing the virtual machines across different Availability Zones satisfies the datacenter-wide failure protection and the 99.99%99.99\% SLA requirements.
3
Identify the required load balancer SKU to distribute traffic across the zones.
Use a Standard SKU Load Balancer.
Only a Standard SKU Load Balancer supports backend pools containing virtual machines distributed across different Availability Zones. A Basic SKU Load Balancer is restricted to virtual machines in the same availability set or VMSS.

Key Concept

Azure Availability Zones and Load Balancer SKU Requirements for High Availability
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Topics

Configure VMs for High Availability

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