Create a Subnet (192.168.1.0/24/ and attach it to Resource Group Created in step 1 (firewall-vnet)(Step - 2)

Create a Subnet (192.168.1.0/24/ and attach it to Resource Group Created in step 1 (firewall-vnet)

The Azure Virtual Network service enables you to securely connect Azure resources to each other with virtual networks (VNets). A VNet is a representation of your own network in the cloud. A VNet is a logical isolation of the Azure cloud dedicated to your subscription. You can also connect VNets to your on-premises network. 

After Creating Virtual network The Azure Dashboard looks something like this

 Create 4 vms named dbserver(centos7),appserver(centos 7),client1(Window Server),client2 (Window Server)