About computer Network: A computer network is a digital telecommunications network which allowsnodes to share resources. In computer networks, computing devices exchange data with each other using connections (data links) between nodes. These data links are established over cable media such as wires or optic cables, or wireless media such as Wi-Fi.
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Network computer devices that originate, route and terminate the data are called network nodes. Nodes are generally identified by network addresses, and can include hosts such as personal computers, phones, and servers, as well as networking hardware such as routers and switches. 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 arelayered (i.e. carried as payload) over other more general communications protocols. This formidable collection of information technology requires skillednetwork management to keep it all running reliably.
Computer networks support an enormous number of applications and servicessuch as access to the World Wide Web, digital video, digital audio, shared use of application and storage servers, printers, and fax machines, and use ofemail and instant messaging applications 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.
Computer networking may be considered a branch of electrical engineering, electronics engineering, telecommunications,computer science, information technology or computer engineering, since it relies upon the theoretical and practical application of the related disciplines.
A computer network facilitates interpersonal communications allowing users to communicate efficiently and easily via various means: email, instant messaging, online chat, telephone, video telephone calls, and video conferencing. A network allows sharing of network and computing resources. Users may access and use resources provided by devices on the network, such as printing a document on a shared network printer or use of a shared storage device. A network allows sharing of files, data, and other types of information giving authorized users the ability to access information stored on other computers on the network. Distributed computing uses computing resources across a network to accomplish tasks.
A computer network may be used by security hackers to deploy computer viruses or computer worms on devices connected to the network, or to prevent these devices from accessing the network via a denial-of-service attack.