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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. Network packet edit main article: Network packet Computer communication links that do not support packets, such as traditional point-to-point telecommunication links, simply transmit data as a bit stream. However, most information in computer networks is carried in packets. A network packet is a formatted unit of data (a list of bits or bytes, usually a few tens of bytes to a few kilobytes long) carried by a packet-switched network. Packets are sent through the network to their destination. Once the packets arrive they are reassembled into their original message.
Packets consist of two kinds of data: control information, and user data (payload). The control information provides data the network needs to deliver the user data, for example: source and destination network addresses, error detection codes, and sequencing information. Typically, control information is found in packet headers and trailers, with payload data in between. With packets, the bandwidth of the transmission medium can be better shared among users than if the network were circuit switched. When one user is not sending packets, the link can be filled with packets from other users, and so the cost can be shared, with relatively little interference, provided the link isn't overused. Often the route a packet needs to take through a network is not immediately available. In that case the packet is queued and waits until a link is free.
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The ability of Ethernet to scale easily (such as quickly adapting to support new fiber optic cable speeds) is a contributing factor to its continued use. 12 Properties edit computer networking promotion 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.
In 1973, the French cyclades network was the first to make the hosts responsible for the reliable delivery of data, rather than this being a centralized service of the network itself. 10 In 1973, robert Metcalfe wrote a formal memo at Xerox parc describing Ethernet, a networking system that was based interests on the Aloha network, developed in the 1960s by norman Abramson and colleagues at the University of Hawaii. In July 1976, robert Metcalfe and david Boggs published their paper "Ethernet: Distributed Packet Switching for Local Computer Networks" 11 and collaborated on several patents received in 19In 1979, robert Metcalfe pursued making Ethernet an open standard. 12 In 1976, john Murphy of Datapoint Corporation created arcnet, a token-passing network first used to share storage devices. In 1995, the transmission speed capacity for Ethernet increased from 10 Mbit/s to 100 Mbit/s. By 1998, Ethernet supported transmission speeds of a gigabit. Subsequently, higher speeds of up to 100 Gbit/s were added (as of 2016).
packet switching to transfer information between computers over a network. Davies pioneered the implementation of the concept with the npl network, a local area network at the national Physical Laboratory (United Kingdom) using a line speed of 768 kbit/s. 3 4 5 In 1965, western Electric introduced the first widely used telephone switch that implemented true computer control. In 1966, Thomas Marill and Lawrence. Roberts published a paper on an experimental wide area network (WAN) for computer time sharing. 6 In 1969, the first four nodes of the arpanet were connected using 50 kbit/s circuits between the University of California at Los Angeles, the Stanford Research Institute, the University of California at Santa barbara, and the University of Utah. 7 leonard Kleinrock carried out theoretical work to model the performance of packet-switched networks, which underpinned the development of the arpanet. 8 9 His theoretical work on hierarchical routing in the late 1970s with student Farouk kamoun remains critical to the operation of the Internet today. In 1972, commercial services using.25 were deployed, and later used as an underlying infrastructure for expanding tcp/IP networks.
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 messaging applications as well as many. 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. Contents History edit see also: History of the Internet The chronology of significant computer-network developments includes: In the late 1950s, early networks of computers included the. Military radar system Semi-automatic Ground Environment (sage). In 1959, Anatolii ivanovich Kitov proposed to the central Committee of the communist auto Party of the soviet Union a detailed plan for the re-organisation of the control of the soviet armed forces and of the soviet economy on the basis of a network of computing. 2 In 1960, the commercial airline reservation system semi-automatic business research environment (sabre) went online with two connected mainframes. Licklider sent a memorandum to office colleagues discussing the concept of the " Intergalactic Computer Network a computer network intended to allow general communications among computer users. In 1964, researchers at Dartmouth College developed the dartmouth Time Sharing System for distributed users of large computer systems.
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For other uses, see. A computer network, or data network, is a digital telecommunications network which allows nodes 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 persuasive 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 hosts such as personal computers, phones, servers as 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 all running reliably.