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You have an Azure Subscription that contains the virtual networks Shown in the following table.
All the virtual networks are peered. Each virtual network contains nine virtual machines.
You need to configure secure RDP corrections to the virtual machines by using Azure Boston.
Whit is the minimum number of Bastion nests required?
According to theMicrosoft documentation, Azure Bastion is a service that provides more secure and seamless RDP and SSH access to virtual machines without any exposure through public IP addresses. You can provision the service directly in your local or peered virtual network to get support for all the VMs within it.
In your scenario, you have three virtual networks that are peered with each other. This means that they can communicate with each other as if they were in the same virtual network. Therefore, you can deploy one Bastion host in any of the virtual networks and use it to connect to all the virtual machines in the peered virtual networks. You don't need to deploy a separate Bastion host for each virtual network or each virtual machine.
For more information about how to deploy and use Azure Bastion, seeTutorial: Deploy Bastion using specified settings: Azure portal.