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Difficulty: MediumConfigure Public and Private IP Addresses

You have an Azure subscription that contains a virtual machine named VM1 and a Basic Load Balancer named LB1. VM1 is currently associated with the backend pool of LB1. You need to assign a public IP address directly to the primary network interface (NIC) of VM1 to allow direct external access for management. Which configuration should you select for the new public IP address?

  1. A Basic SKU public IP address with Dynamic allocationAnswer
  2. B
    A Standard SKU public IP address with Static allocation
  3. C
    A Standard SKU public IP address with Dynamic allocation
  4. D
    A Basic SKU public IP address with zone-redundant availability

Answer

A Basic SKU public IP address with Dynamic allocation
The correct configuration is a Basic SKU public IP address with Dynamic allocation. Since the virtual machine is currently associated with a Basic Load Balancer, any public IP address directly attached to the virtual machine's network interface must match the load balancer's SKU. Basic SKU public IPs support both Dynamic and Static allocation methods, making this configuration valid.

Step-by-Step Solution

1
Identify the existing resources and constraint associations.
The target virtual machine (VM1) is part of a Basic Load Balancer's backend pool.
Azure enforces SKU alignment across resources attached to the same virtual machine network interfaces. A virtual machine in the backend pool of a Basic Load Balancer can only be associated with Basic SKU public IP addresses.
2
Filter public IP SKU options based on compatibility rules.
Standard SKU public IP options must be discarded due to SKU mismatch, leaving only Basic SKU configurations.
Standard SKU public IPs cannot be associated with a network interface if the VM is bound to a Basic Load Balancer.
3
Evaluate the capabilities and configuration options of the Basic SKU public IP.
Select a Basic SKU public IP with Dynamic allocation, and rule out zone redundancy.
Basic SKU public IPs support Dynamic allocation but do not support availability zones or zone-redundant configurations, which are features exclusive to the Standard SKU.

Key Concept

SKU alignment and compatibility rules for Azure Public IP addresses and Load Balancers
Estimated Time:1m 30s
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Topics

Configure Public and Private IP Addresses

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