Multiple virtual networks are all peered; each contains nine VMs. To provide secure RDP access via Azure Bastion to all VMs, what is the minimum number of Bastion hosts required?

Azure Bastion can be deployed into a single virtual network (VNet) and then used to connect to virtual machines (VMs) in peered VNets. As long as the VNets are peered, a single Bastion host can provide secure RDP/SSH access to all VMs across those peered networks. Therefore, only one Bastion host is needed, regardless of the number of peered VNets or VMs within them. Deploying multiple Bastion hosts (3, 9, or 10) would be unnecessary and incur additional costs without providing additional functionality in this scenario.