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Difficulty: MediumConfigure Azure Bastion

Your company plans to implement secure, browser-based administrative access to Azure virtual machines in a virtual network named `VNet-Corp-01`. The virtual network is configured with an address space of 10.50.0.0/1610.50.0.0/16. You need to create a dedicated subnet for the Azure Bastion resource. What is the correct subnet name and the minimum subnet mask required for this deployment?

  1. A
    Subnet name: `BastionSubnet`; minimum prefix size: /26/26
  2. B
    Subnet name: `AzureBastionSubnet`; minimum prefix size: /27/27
  3. Subnet name: `AzureBastionSubnet`; minimum prefix size: /26/26Answer
  4. D
    Subnet name: `AzureBastionSubnet-Prod`; minimum prefix size: /28/28

Answer

The subnet name must be exactly AzureBastionSubnet, and the minimum prefix size must be /26.
The correct configuration requires the dedicated subnet to be named exactly 'AzureBastionSubnet' and to have a prefix length of /26 or larger. This ensures proper service mapping and sufficient IP allocation for the Bastion instance scaling.

Step-by-Step Solution

1
Determine the required naming convention for the dedicated subnet.
The subnet must be named exactly `AzureBastionSubnet`.
Azure Bastion uses this specific name to bind the gateway resources and route traffic within the virtual network.
2
Identify the minimum address space prefix requirement for the Bastion subnet.
The subnet must have a subnet mask prefix of /26/26 or larger.
A prefix of /26/26 provides at least 64 IP addresses, which are necessary for Azure Bastion's platform management, scaling, and private endpoints.
3
Select the option that matches both naming and sizing constraints.
Select the subnet named `AzureBastionSubnet` with a minimum prefix size of /26/26.
This is the only configuration that satisfies all Azure platform deployment requirements.

Key Concept

Azure Bastion subnet requirements
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Topics

Configure Azure Bastion

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