Firewall placement is all about how you want to configure the network. Typically, you can replace the router with the firewall if your local area network has only one path in and one path out of your network. So it goes something like this:
Open Windows Firewall settings by clicking the Start button on the bottom-left corner of your desktop. Click the Control Panel option on the right, and in the search box, type “firewall.” Continue to the Windows Firewall. Activate or deactivate the firewall by checking the appropriate On or Off boxes on the left pane.
Remember both Windows and Macs allow you to set your firewall through the “advanced” menu. Configure your firewall selecting the connections or applications you wish to block or bypass by the firewall.