The three elements of a computer network are computer equipment, communication lines and connecting devices and network protocols. Computer network system elements are as follows:
1, computer system: workstation (terminal equipment, or client, usually a PC), network server (usually a high-performance computer).
2, network communication equipment (network switching equipment, interconnection equipment and transmission equipment) : including network cards, network cables, hubs (hubs), switches, routers, etc.
3, network external equipment: such as high-performance printers, large capacity hard disks, etc
4, network software: including network operating systems, such as Unix, NetWare, Windows NT, etc.; Customer connection software (including DOS, Windows, Unix operating systems, etc.); Network management software, etc.