A virtual network is a network that uses software and wireless technology to connect devices, servers, and data centers. Virtual networks are not wired, so devices interact with each other through the internet. An Azure virtual network enables many types of Azure resources to securely communicate with each other, the internet and on premises network.

In creating an Azure virtual network with four subnets, begin by.

• Signing up or logging onto the Azure portal.
• When the portal is opened, search for and select virtual network

• Click on "+ create" to open the page to select and enter network details
• When the create virtual machine page opens, input the virtual network details such as project details which comprises of the subscription and resource group, then the instance details such as virtual network name and region.
• Click on "Next" to open the other tab

• When the security tab opens, leave the details as default

• Click on "next" to move to the next tab

• The "IP addresses" tab opens then input 192.148.30.0 IP address with CIDR class 24

• Click on "Add a subnet" to add the four subnets

• The sub-page opens, add the four subnets. In the sub-page, input the subnet name and change the CIDR size to 26

• Click on "Add" to add the subnets

• Click on "Review + create" then "create"