See solution below. Explanation Step 1: Click Create a resource in the portal. Step 2: Enter Virtual network in the Search the Marketplace box at the top of the New pane that appears. Click Virtual network when it appears in the search results. Step 3: Select Classic in the Select a deployment model box in the Virtual Network pane that appears, then click Create. Step 4: Enter the following values on the Create virtual network (classic) pane and then click Create: Name: VNET1008 Address space: 10.0.0.0/16 Subnet name: subnet0 Resource group: Create new Subnet address range: 10.0.0.0/24 Subscription and location: Select your subscription and location. Step 5: In the portal, you can create only one subnet when you create a virtual network. Click Subnets (in the SETTINGS section) on the Create virtual network (classic) pane that appears. Click +Add on the VNET1008 - Subnets pane that appears. Step 6: Enter subnet1 for Name on the Add subnet pane. Enter 10.0.1.0/24 for Address range. Click OK. Step 7: Create the third subnet: Click +Add on the VNET1008 - Subnets pane that appears. Enter subnet2 for Name on the Add subnet pane. Enter 10.0.2.0/24 for Address range. Click OK. References: https://docs.microsoft.com/en-us/azure/virtual-network/create-virtual-network-classic