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Networks (Terms (Network: a linked set of computer systems, capable of…
Networks
Terms
Network: a linked set of computer systems, capable of sharing computer power and resources
Workstation: a computer connected to a network at which users interact with software stored on the network
Stand-alone: a computer not connected to a network, which normally serves as a personal computer for basic use
Bandwidth: the amount of information/data that can be sent over a network connection in a given period of time (bits per second).
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Intranet: a private Internet website used internally within an organisation to share internal documents, training material and business applications
Extranet: uses the Internet to connect to a business network from different locations; used to communicate and share data.
Networking Equipment
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Modem + router: a device used to provide communication in a WAN by translating analogue signals to digital and vice-versa.
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Communication techniques
Satellites: an arrangement in which the upstream and downstream data are sent from and arrive at a computer through a satellite.
Coaxial cables: a technology that uses copper wires to provide high-speed data to businesses and homes
Radio waves: used in broadcasting of data through the use of wavelengths along the electromagnetic spectrum. These are used in TV broadcasting, mobile phones, Bluetooth, garage door openers, GPS and Wi-Fi equipment.
Fibre-optic: a very efficient method of transmitting data signals over very long distances using optical cables, which can carry a lot more data at one time than traditional copper wires, since they are not prone to electromagnetic waves.
Advantages
Resources can be shared (hardware sharing, application server, file server)
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An easier way of communication between network computer users through the use of e-mails and workgroup computing (users can work on a document by using the same application concurrently).
Network Types
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MAN: a computer network that interconnects users with computer resources in an area or region larger than one covered by a large LAN but smaller than one covered by a WAN.
LAN topologies
Bus: each device is connected to a single cable which starts and ends with a terminator. A T-bone connector enables the addition of devices to the network. Rarely used nowadays.
Ring: each device connects to two devices. Data passes from one device to another in a clockwise and anti-clockwise motion forming a large circle. Rarely used nowadays.
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