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Difficulty: HardConfigure Azure Load Balancer

An administrator is configuring a public Azure Load Balancer named LB1 by using the Standard SKU. LB1 will distribute inbound traffic to two virtual machines named VM1 and VM2. VM1 is a standalone virtual machine that has a Standard SKU public IP address associated with its network interface (NIC). VM2 is a standalone virtual machine that has a Basic SKU public IP address associated with its network interface (NIC). When the administrator attempts to add VM2 to the backend pool of LB1, the operation fails. You need to resolve the issue while ensuring that both virtual machines retain their respective public IP addresses. What should you do?

  1. Upgrade the public IP address of VM2 to the Standard SKU.Answer
  2. B
    Change the SKU of LB1 to Basic.
  3. C
    Move VM1 and VM2 to a new Availability Set.
  4. D
    Associate the Basic SKU public IP of VM2 with the frontend IP configuration of LB1.

Answer

Upgrade the public IP address of VM2 to the Standard SKU.
The correct answer is to upgrade the public IP address of the second virtual machine to the Standard SKU. In Azure, a Standard SKU public load balancer requires all network interfaces in its backend pool to be associated with Standard SKU resources. If any of the backend virtual machines have instance-level public IPs assigned directly to their network interfaces, those public IPs must be upgraded to the Standard SKU to avoid a SKU mismatch error.

Step-by-Step Solution

1
Identify the cause of the configuration failure.
The failure occurs because VM2 has a Basic SKU public IP associated with its NIC, while the load balancer (LB1) is configured as a Standard SKU load balancer.
Azure Standard Load Balancer backend pool members must use Standard SKU public IPs if they have instance-level public IPs assigned directly to their network interfaces. Mixing Basic SKU and Standard SKU resources within the same backend pool configuration is not supported.
2
Select the resolution that preserves the public IP addresses on both virtual machines.
Determine that upgrading VM2's public IP address from Basic to Standard SKU is the correct method.
Upgrading VM2's public IP SKU resolves the compatibility conflict with the Standard SKU Load Balancer without requiring the deletion of the virtual machine or removal of its public IP interface.

Key Concept

Azure Standard Load Balancer requires all backend pool network interfaces with instance-level public IP addresses to use the Standard SKU.
Estimated Time:2m 0s
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Topics

Configure Azure Load Balancer

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