29-06-2017, 10:09 AM
A computer network or data network is a telecommunications network that allows nodes to share resources. In computer networks, the network computing devices exchange data between each other via a data link. The connections between the nodes are established using cable or wireless media.
Network devices that originate, route, and terminate data are referred to as network nodes. Nodes can include hosts such as personal computers, telephones, servers, as well as network hardware. It can be said that two devices are connected in a network when one device is capable of exchanging information with the other device, whether or not they have a direct connection to each other. In most cases, application-specific communications protocols overlap (that is, transported as payload) over other more general communications protocols. This formidable collection of information technology requires specialized network management to keep everything running reliably.
Computer networks support a large number of applications and services such as access to the World Wide Web, digital video, digital audio, application and storage server sharing, printers and fax machines, and use of instant messaging and mail applications electronic. much others. Computer networks differ in the transmission medium used to carry their signals, communications protocols to organize network traffic, network size, topology and organizational intent. The best-known computer network is the Internet.