A network is any collection of independent computers that communicate with one another over a shared network medium. A computer network is a collection of two or more connected computers. The computers on a network may be linked through cables, telephone lines, radio waves, satellites, or infrared light beams.
When these computers are joined in a network, people can share files and peripherals such as modems, printers, tape backup drives, or CD-ROM drives. When networks at multiple locations are connected using services available from phone companies, people can send e-mail, share links to the global Internet, or conduct video conferences in real time with other remote users.
Every network includes:
- At least two computers Server or Client workstation.
- Networking Interface Card's (NIC)
- A connection medium, usually a wire or cable, although wireless communication between networked computers and peripherals is also possible.
- Network Operating system software, such as Microsoft Windows NT or 2000, Novell NetWare, Unix and Linux.
Benefits of Computer Networks
- Sharing hardware or software
- Centralize administration and support
- Increased speed
- Reduced cost
- Improved security
- Centralized software managements
- Electronic mail
- Flexible access
Disadvantages of Computer Networks
- High cost of installation
- Requires time for administration
- Failure of server & cables
