You must deploy five VMs to a subnet; each VM will have a public and a private IP and all VMs must share identical inbound and outbound security rules. What is the minimum number of network interfaces required?

Each virtual machine (VM) in Azure requires at least one network interface (NIC) to enable network communication. Since you are deploying five VMs, you will need a minimum of five network interfaces, one for each VM. While each VM will have both a public and a private IP address, these are assigned to the single network interface per VM, not to separate interfaces. Similarly, network security groups (NSGs) that define inbound and outbound security rules are associated with either the network interface or the subnet, not with additional network interfaces. Therefore, five VMs necessitate five network interfaces.