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Difficulty: HardConfigure Azure Load Balancer

To support a web application, you plan to configure a public Azure Load Balancer named App-LB. You have three virtual machines: Web-VM1, Web-VM2, and Web-VM3. Web-VM1 is deployed in Availability Zone 1. Web-VM2 is deployed in Availability Zone 2. Web-VM3 is a standalone virtual machine with no zone redundancy. All three virtual machines are located in the same virtual network and subnet. Each virtual machine has a Basic SKU public IP address assigned to its primary network interface. You need to configure App-LB to distribute incoming internet traffic to the three virtual machines. The solution must ensure that traffic can be distributed across all three virtual machines. Which two actions should you perform? (Select two.)

  1. Deploy the load balancer using the Standard SKU.Answer
  2. Associate Standard SKU public IP addresses with the virtual machines' network interfaces.Answer
  3. C
    Deploy the load balancer using the Basic SKU and group the virtual machines within an Availability Set.
  4. D
    Configure the backend pool of a Basic SKU load balancer by targeting the virtual network and subnet directly.

Answer

Deploy the load balancer using the Standard SKU, and associate Standard SKU public IP addresses with the virtual machines' network interfaces.
To support virtual machines deployed across different Availability Zones (Zone 1 and Zone 2) and a standalone virtual machine, you must deploy a Standard SKU Load Balancer. Basic Load Balancers only support virtual machines within a single Availability Set or Scale Set. Furthermore, all public IP addresses associated with the network interfaces of virtual machines in a Standard Load Balancer's backend pool must also be of the Standard SKU; Basic SKU public IP addresses are incompatible and will block standard load balancing configuration.

Step-by-Step Solution

1
Analyze the virtual machine locations and requirements.
Web-VM1 is in Zone 1, Web-VM2 is in Zone 2, and Web-VM3 is standalone. Because they span multiple Availability Zones and include a standalone VM, a Basic Load Balancer cannot be used since it only supports VMs in a single Availability Set or Scale Set.
This determines that a Standard SKU Load Balancer is required for the deployment.
2
Verify the compatibility of the public IP addresses on the virtual machines.
The virtual machines currently have Basic SKU public IP addresses. When using a Standard Load Balancer, all network interfaces in the backend pool must use Standard SKU public IP addresses or have no public IP addresses assigned.
Mismatched SKUs between the load balancer and backend resources will cause validation or connectivity errors.
3
Determine the necessary configuration changes.
The administrator must deploy a Standard SKU Load Balancer and replace or upgrade the virtual machines' Basic public IP addresses to the Standard SKU.
This aligns the configuration with Azure's SKU compatibility rules for Standard Load Balancers.

Key Concept

Azure Load Balancer SKU compatibility and backend pool constraints
Estimated Time:2m 0s
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Topics

Configure Azure Load Balancer

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