Network and Internet
Network and Internet
Network
A network consists of two or more computers that are linked in order to share resources (such as Printers, CD-ROMs, Scanners, etc.), exchange files, or allow electronic communications. The computers on a network may be linked through cables, telephone lines, radio waves, satellites, or infrared light beams.
A computer network is an interconnected collection of autonomous computers.
• Interconnected meaning two computers have the ability to exchange information using copper cabling, fiber optics, or radio.
• Autonomous meaning where no one computer controls any other computer (i.e. no computer can forcibly start or stop another computer)
• Computers can be PC’s, workstations and other “specialized” computers such as hubs, switches, and routers
Uses of Network
• Resource Sharing: The goal is to make all programs, equipment’s, and especially data, available to anyone on the network without regard to the physical location of the resource and the user.
• Server-Client model: One can imagine a company's information system as consisting of one or more databases and some number of employees who need to access them remotely. In this model, the data is stored on powerful computers called servers. Often these are centrally housed and maintained by a system administrator. In contrast, the employees have simple machines, called clients, on their desks, with which they access remote data.
• Communication Medium: A computer network can provide a powerful communication medium among employees. Virtually every company that has two or more computers now has e-mail (electronic mail), which employees generally use for a great deal of daily communication
• E-Commerce: A goal that is starting to become more important is doing business with consumers over the Internet. Airlines, bookstores, and music vendors have discovered that many customers like the convenience of shopping from home.
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