What is the impact of importing firewall rules from another computer?

Importing firewall rules from another computer results in the overwriting of all existing firewall rules on the target system. When the import process is executed, it takes the specified ruleset from the source and entirely replaces the existing configuration within the Windows Firewall on the receiving computer. This action is fundamental to ensure that the imported rules are applied as intended without any conflicts or residual settings from previous configurations.

It's important to note that it's typically necessary to ensure that critical existing configurations are backed up before performing an import operation, as this process does not create a backup of current rules automatically. Consequently, understanding this consequence is crucial for maintaining a secure and functional network environment when managing firewall settings.