Although your entire network may be surrounded by a firewall, it’s also good to have personal software firewalls to monitor each local computer. Software firewalls can monitor outbound communications, which would be helpful in preventing botnet attacks. The firewall would detect that your computer is constantly trying to communicate with the third party botnet controller.
Windows has a built in software firewall called Windows Firewall or in Windows 10 it’s called Windows Defender Firewall. There are also many third party options. Software firewalls should constantly by enabled to perform continuous monitoring.