08-11-2017, 03:32 PM
A computer network or data network is a digital telecommunications network that allows nodes to share resources. In computer networks networked computing devices exchange data with each other using a data link. The connections between the nodes are established using cable media or wireless media.
The computer network devices that originate, route, and terminate the data are called network nodes. The nodes can include hosts such as personal computers, telephones, servers and network hardware. It can be said that two devices of this type are networked when a device can exchange information with the other device, whether or not they have direct connection between them. In most cases, the application-specific communication protocols are layered (that is, transported as payload) over other more general communication protocols. This formidable collection of information technology requires specialized network management to make everything work reliably.
Computer networks support an enormous amount of applications and services such as access to the World Wide Web, digital video, digital audio, sharing of application servers and storage, printers and fax machines, and use of electronic mail and instant messaging applications. , as well as many others. Computer networks differ in the transmission medium used to transmit their signals, communication protocols to organize network traffic, network size, topology and the intention of the organization. The most known computer network is the Internet.