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Difficulty: MediumApplication Load Balancing and Delivery

A retail company is modernizing a regional store-management application in the West Europe region. The application requires SSL/TLS termination and URL-based routing to direct web traffic to different backend pools. In addition, a legacy inventory sync service running on TCP port 9000 must be load balanced across a database replication virtual machine (VM) pool. The database replication VMs currently have Basic SKU public IP addresses assigned to their network interfaces. The proposed design uses an Azure Application Gateway for the web traffic and an Azure Standard Load Balancer for the inventory sync service. Which action should you recommend to ensure the load balancing configuration for the database replication tier is valid?

  1. Upgrade the public IP addresses of the database replication VMs to the Standard SKU.Answer
  2. B
    Deploy an Azure Basic Load Balancer and configure it with a Standard SKU frontend IP.
  3. C
    Change the database replication VMs' public IP addresses to dynamic allocation using the Basic SKU.
  4. D
    Associate the Basic SKU public IP addresses with a Standard SKU public IP prefix.

Answer

Upgrade the public IP addresses of the database replication VMs to the Standard SKU.
The correct action is to upgrade the public IP addresses of the database replication VMs to the Standard SKU. Azure Standard Load Balancer enforces a strict rule that all associated backend resources that have public IP addresses must use the Standard SKU. If there is a mix of Basic SKU public IPs and a Standard Load Balancer, the deployment will fail validation.

Step-by-Step Solution

1
Identify the load balancer SKU requirements for backend virtual machines.
Azure Standard Load Balancer requires all attached network interfaces with public IP addresses to use the Standard SKU.
This is a fundamental platform limitation to ensure security and predictability of Standard SKU resources.
2
Identify the current SKU of the database replication VMs' public IPs.
The database replication VMs are currently assigned Basic SKU public IP addresses.
We must identify the source of the incompatibility to resolve the configuration failure.
3
Select the appropriate remediation step.
Recommend upgrading the public IP addresses of the database replication VMs from Basic SKU to Standard SKU.
Upgrading the public IPs to Standard SKU aligns them with the Standard Load Balancer's requirements and allows successful deployment.

Key Concept

Standard SKU public IP requirements for Azure Standard Load Balancer backend pools
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Topics

Application Load Balancing and Delivery

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