Learning Linux Firewall : Firewalld., A beginner’s introduction to Firewalld on the Linux Platform.
This course is designed for beginners and introduces you to firewall concepts, installation of firewalld , touches upon the zones in the firewalld. The course also equips you to understand the concept of ports and how client-server applications use the ports. There are sections dedicated to troubleshooting Firewalld issues from Windows and Linux platforms. There is innovative use of netcat command for you to anticipate future corrective course of action.