Explanation: Box 1: A network Rule You can use a network rule when you want to filter traffic based on IP addresses, any ports, and any protocols. Box 2: An application Rule You can use an application rule when you want to filter traffic based on fully qualified domain names (FQDNs), URLs, and HTTP/HTTPS protocols. https://learn.microsoft.com/en-us/azure/firewall/policy-rule-sets#rule-types