Question

Explain the need of network

Answer 1

A computer network, or data network, is adigital telecommunications network which allows nodes to share resources. In computer networks, computing devices exchange datawith each other using connections between nodes (data links.) These data links are established over cable media such as wires or optic cables, or wireless media such as WiFi.

Network computer devices that originate, route and terminate the data are called network nodes.[1] Nodes can include hostssuch as personal computers, phones, serversas well as networking hardware. Two such devices can be said to be networked together when one device is able to exchange information with the other device, whether or not they have a direct connection to each other. In most cases, application-specific communications protocols are layered (i.e. carried as payload) over other more general communications protocols. This formidable collection of information technology requires skilled network management to keep it allrunning reliably.

Computer networks support an enormous number of applications and services such as access to the World Wide Web, digital video,digital audio, shared use of application and storage servers, printers, and fax machines, and use of email and instant messagingapplications as well as many others. Computer networks differ in the transmission medium used to carry their signals,communications protocols to organize network traffic, the network's size, topology,traffic control mechanism and organizational intent. The best-known computer network is the Internet.

Answer 2

NEED FOR NETWORKING

Computer networking is found to be extremely useful for a variety of reasons . some of these are discussed below :

resource sharing : All the computers on a network can share hardware ( like printer and modem ) and software

reliability : If a computer on a network goes down due to some hardware failure , its share of work can be passed on to another computer.

Financial benefits : Small computers ( PCs ) have a better price / performance ratio compared to large ones. A mainframe computer may be ten times faster than a PC , but it will cost a hundred times more. hence , most organizations prefer a computer network with many PCs instead of one large centralised computer.

Better communication database : In a organization with branches at various places computer networking provides a cheap and easy mode of communication.

Access to remote databases : Computer networks provide easy access to remote databases. so it is possible to avoid unnecessary trouble and waste of time involved in physically booking airline and rail tickets , hotel rooms , etc.

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