A computer network is a telecommunications network that allows computers to exchange data. The physical connection among networked computing devices is established applying either cable media or wireless media. The best-known computer network is the Internet. Network devices that originate, route and terminate the data are called network nodes.[1] Nodes can include hostssuch as servers and personal computers, as well as networking hardware. Two devices happen to be said to be networked when a process in one system is able to exchange information which has a process within device. Computer networks support applications including access to the World Wide World wide web, shared use of application and storage servers,  printers, and fax equipment, and employ of email and instant messaging applications. The remainder of the article discusses local area network technologies and classifies these people according to the pursuing characteristics: the physical multimedia used to transfer signals, the communications protocols used to arrange network targeted traffic, along with the network's size, its topology and its organizational intent. The communication press used to hook up devices to form a computer network include electrical cable (HomePNA,  power line communication,  G. hn), optic fiber (fiber-optic communication), and radio waves (wireless networking). In the OSI version, these are described at layers 1 and 2 — the physical layer as well as the data link layer. A widely-adopted family of interaction media employed in local area network (LAN) technology is each known as Ethernet. The press and protocol standards that enable connection between networked devices more than Ethernet is usually defined by IEEE 802. Ethernet encompasses equally wired and wireless LAN technologies. " cable " LAN gadgets transmit alerts over wire media. Wi-fi LAN devices use radio waves or infrared signals as a tranny medium. Born technologies[edit] The order from the following born technologies are, roughly, via slowest to fastest transmitting speed. Garbled pair wire is the most widely used method for all telecommunication. Twisted-pair wiring consist of water piping wires which have been twisted into pairs. Common telephone cables consist of two insulated copper wires twisted into pairs. Computer network cabling (wired Ethernet as defined by IEEE 802. 3) consists of four pairs of copper wiring that can be utilized for both voice and data transmission. The application of two wiring twisted jointly helps to reducecrosstalk and electromagnetic induction. The transmission velocity ranges via 2 mil bits every second to 10 billion bits per second. Turned pair wiring comes in two forms: unshielded twisted match (UTP) and shielded twisted-pair (STP). Every form also comes in several category ratings, designed for use in different scenarios. Coaxial cable is trusted for cable television systems, business office buildings, and other work-sites intended for local area systems. The wires consist of birdwatcher or aluminum wire surrounded by an insulating layer (typically a flexible materials with a high dielectric constant), which on its own is surrounded by a conductive layer. The insulation allows minimize disturbance and contortion. Transmission velocity ranges by 200 , 000, 000 bits every second to more than 500 million portions per second. ITU-T G. hn technology uses existing home wiring (coaxial cable, phone lines and power lines) to create a high speed (up to at least one Gigabit/s) local area network. An optical fiber is a glass fiber. It uses pulses of light to transmit data. Some advantages of optical materials over steel wires are much less transmission damage, immunity coming from electromagnetic the radiation, and very quickly transmission rates of up to trillions of parts per second. One can use different colors of lights to boost the number of communications being directed over a fibers optic cable. Wireless technologies[edit]

Main content:  Wireless network

Terrestrial microwave – Terrestrial microwave communication uses Earth-based transmitters and receivers like satellite food. Terrestrial...

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