This SCAS course typically refers to equipment facilitating the use of a computer network. Typically, these include routers, switches, hubs, gateways, and access points, network interface cards, networking cables, network bridges, modems, ISDN adapters, firewalls and other related hardware. Computer hardware includes various physical parts of computer. Networking involves the practice of linking a group of two or more computer systems for sharing data and information. The professionals related to discipline of computer hardware research and computer network developments are called hardware and networking engineers. They also design and supervise manufacturing and installation of hardware.