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Using and setting up DNS, configuring a DHCP server, how to use and setup IPV6. Other general network related services.
How to setup and administrate FTP
Linux Apache MySQL and PHP related subjects, including tutorials and of course questions.
Mail related services and questions.
SSH, SCP, VNC, tsclient, rdesktop, Rsync and various other methods to remotely access your machine.
How to setup iptables, forward and close ports, close ports. How to setup a NAT and stuff like that.