Question

Difficulty: MediumConfigure Azure Load Balancer

You plan to configure a public Azure Load Balancer named LB1 to load balance inbound traffic to two virtual machines named VM1 and VM2. The virtual machines are currently configured as follows:

* VM1 has a network interface associated with a Basic SKU public IP address.
* VM2 has a network interface with no public IP address.

You need to deploy LB1 as a Standard SKU load balancer.

Which of the following two actions must you perform? (Select two.)

  1. Configure the frontend IP configuration of LB1 using a Standard SKU public IP address.Answer
  2. Disassociate the Basic SKU public IP address from VM1's network interface.Answer
  3. C
    Configure the frontend IP configuration of LB1 using a Basic SKU public IP address.
  4. D
    Associate a Basic SKU public IP address to VM2's network interface.

Answer

To successfully deploy the Standard SKU public Load Balancer and load balance traffic to the virtual machines, you must configure the frontend IP configuration of the load balancer using a Standard SKU public IP address and disassociate the Basic SKU public IP address from the network interface of the first virtual machine.
The correct configurations involve using a Standard SKU public IP address for the frontend of the Standard Load Balancer and disassociating the Basic SKU public IP from the first virtual machine. Standard SKU Load Balancers require Standard SKU public IP addresses for their frontend configurations. Furthermore, all virtual machines in the backend pool of a Standard Load Balancer must either use Standard SKU public IP addresses or have no public IP address on their network interfaces.

Step-by-Step Solution

1
Identify the Load Balancer SKU and its frontend requirements.
The load balancer is a Standard SKU public load balancer, which requires a Standard SKU public IP address for its frontend configuration.
Azure Load Balancer SKUs and public IP SKUs must match; a Standard Load Balancer cannot use a Basic SKU public IP.
2
Analyze the backend pool VM configurations for public IP compatibility.
VM1 has a Basic SKU public IP, which is incompatible with a Standard SKU Load Balancer's backend pool. VM2 has no public IP, which is compatible.
Standard SKU Load Balancer backend pool members cannot have Basic SKU public IPs associated with their NICs.
3
Determine the necessary actions to achieve compatibility.
Configure the frontend of the load balancer with a Standard SKU public IP and remove the Basic SKU public IP from the first virtual machine.
These configurations satisfy the SKU alignment requirements for both the frontend and the backend pool.

Key Concept

Azure Load Balancer SKU compatibility requires that the Load Balancer SKU, frontend IP SKU, and backend VM public IP SKUs all align (specifically, Standard SKU Load Balancers require Standard SKU public IPs and are incompatible with Basic SKU public IPs on backend virtual machines).
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