Network technicians are responsible for the setup, maintenance, and upgrading of networks and resources, and prepare presentations for informing the management about the need for upgrading network resources. A network support technician should have knowledge about popular networking software, such as Novell Netware and the UNIX operating system.
People involved in network support should also be familiar with standard network configurations like peer-to-peer and client-server hookups.
More info: subnetting - https://www.fieldengineer.com/skills/subnetting