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Difficulty: MediumConfigure Azure Load Balancer

An administrator deploys a Basic SKU public Azure Load Balancer to distribute traffic to two virtual machines named VM1 and VM2. VM1 is located in Availability Zone 1, and VM2 is located in Availability Zone 2. Both virtual machines are configured with Standard SKU public IP addresses. When attempting to add the network interfaces of VM1 and VM2 to the load balancer's backend pool, the virtual machines are not available for selection. Which change should the administrator implement to resolve this issue?

  1. A
    Reconfigure the frontend IP configuration of the load balancer to use a Basic SKU public IP address.
  2. B
    Associate VM1 and VM2 with a new Availability Set within the same virtual network.
  3. Deploy a Standard SKU public Load Balancer to replace the Basic SKU public Load Balancer.Answer
  4. D
    Deploy Basic SKU public IP addresses on the network interfaces of VM1 and VM2.

Answer

Deploy a Standard SKU public Load Balancer to replace the Basic SKU public Load Balancer.
Deploying a Standard SKU Load Balancer resolves both constraint violations. The Standard SKU Load Balancer supports backend pool members located in different Availability Zones and is fully compatible with Standard SKU public IP addresses configured on the virtual machines' network interfaces.

Step-by-Step Solution

1
Identify the restrictions of the Basic SKU public Load Balancer regarding availability zones and backend pool members.
Basic SKU Load Balancers do not support backend pools containing virtual machines distributed across different Availability Zones.
To understand why VM1 and VM2 are not available for selection in the backend pool configuration.
2
Identify the SKU compatibility requirements between the Load Balancer and the public IP addresses of the backend virtual machines.
Backend virtual machines with Standard SKU public IP addresses require a Standard SKU Load Balancer.
Basic SKU Load Balancers cannot be mixed with Standard SKU public IP addresses on the backend network interfaces.
3
Determine the correct component SKU needed to support both Availability Zones and Standard SKU public IPs.
A Standard SKU Load Balancer supports both Availability Zones and Standard SKU public IPs.
To resolve the configuration limitation and successfully associate the virtual machines with the backend pool.

Key Concept

Azure Load Balancer SKU feature support and compatibility rules regarding Availability Zones and public IP SKUs.
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Topics

Configure Azure Load Balancer

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