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Networking
Computer networking is the scientific and engineering discipline concerned with communication between computer systems. Such networks involve at least two devices capable of being networked with at least one usually being a computer. The devices can be separated by a few meters (e.g. more...
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via Bluetooth) or thousands of kilometers (e.g. via the Internet). Computer networking is sometimes considered a sub-discipline of telecommunications.
History
Carrying instructions between calculation machines and early computers was done by human users. In September 1940 George Stibitz used a teletype machine to send instructions for a problem set from his Model K at Dartmouth College in New Hampshire to his Complex Number Calculator in New York and received results back by the same means. Linking output systems like teletypes to computers was an interest at the Advanced Research Projects Agency (ARPA) when, in 1962, J.C.R. Licklider was hired and developed a working group he called the "Intergalactic Network", a precursor to the ARPANet. In 1964, researchers at Dartmouth developed the Dartmouth Time Sharing System for distributed users of large computer systems. The same year, at MIT, a research group supported by General Electric and Bell Labs used a computer (DEC's PDP-8) to route and manage telephone connections. Throughout 1960s Leonard Kleinrock, Paul Baran and Donald Davies had independently conceptualized and developed network systems consisting of datagrams or packets that could be used in a packet switching network between computer systems. In 1969 the University of California at Los Angeles, SRI (in Stanford), University of California at Santa Barbara, and the University of Utah were connected as the beginning of the ARPANet network using 50 kbit/s circuits.
Networks, and the technologies needed to connect and communicate through and between them, continue to drive computer hardware, software, and peripherals industries. This expansion is mirrored by growth in the numbers and types of users of networks from researcher
Categorizing
By network layer
See the seven layer OSI reference model and the four or five layer TCP/IP model
Application layer;
Presentation layer (Only in the OSI model);
Session layer (Only in the OSI model);
Transport layer;
Network layer;
Data Link layer
Media access control sublayer;
Logical link control sublayer;
;
Physical layer;
By scale
Personal area network (PAN);
Local area network (LAN)
Wireless local area network(WLAN);
;
Campus area network (CAN);
Metropolitan area network (MAN);
Wide area network (WAN);
By connection method
HomePNA;
Power line communication;
Ethernet;
WiFi;
Read more at Wikipedia.org
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