SIMULATION - You need to deploy an Azure firewall to a virtual network named VNET3. To complete this task, sign in to the Azure portal and modify the Azure resources. This task might take several minutes to complete. You can perform other tasks while the task completes. 

See the explanation below.

To add an Azure firewall to a VNET, the VNET must first be configured with a subnet named AzureFirewallSubnet (if it doesn`t already exist). Configure VNET3. 1. In the Azure portal, type Virtual Networks in the search box, select Virtual Networks from the search results then select VNET3.Alternatively, browse to Virtual Networks in the left navigation pane. 2. In the Overview section, note the Location (region) and Resource Group of the virtual network.We`ll need these when we add the firewall. 3. Click on Subnets. 4. Click on + Subnet to add a new subnet. 5. Enter AzureFirewallSubnet in the Name box.The subnet must be named AzureFirewallSubnet. 6. Enter an appropriate IP range for the subnet in the Address range box. 7. Click the OK button to create the subnet. Add the Azure Firewall. 1. In the settings of VNET3 click on Firewall. 2. Click the Click here to add a new firewall link. 3. The Resource group will default to the VNET3 resource group.Leave this default. 4. Enter a name for the firewall in the Name box. 5. In the Region box, select the same region as VNET3. 6. In the Public IP address box, select an available public IP address if one exists, or click Add new to add a new public IP address. 7. Click the Review + create button. 8. Review the settings and click the Create button to create the firewall. Reference: https://docs.microsoft.com/en-us/azure/firewall/tutorial-firewall-deploy-portal