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Assignment 2 1. Wong Mun Sim, Sylvia (s970588) Group member :
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communications computer And networking
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One computer can use the laser printer. The other computer can use the plotter. The hardware is not shared between users
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Hardware sharing The three computers can use both the plotter and the laser printer. The advantage of sharing hardware via networks
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The two people can ‘talk’ by typing messages to each other 2. communication
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Data sharing in a networking 3. Data sharing
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Local area network (LAN) Wide area network (WAN) Type of network 1. 2.
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1. Local area network (LAN) A LAN links independent computers and other peripheral devices over short distances. 2. Wide area network (WAN) A wide area network links computer systems over long distances.
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Means of communication 1. Twisted-pair wire 2. Coaxial cable 3. Optical fibre 4. microwave 5. satellite
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- It us typically used for telephone lines. - A modem is needed for signal - Telephone lines are designed for voice communication while computers use a digital signal. Twisted-wire pair
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modem When two computers communicate to each other over a telephone lines, a modem is required for modulation and demodulation of signals.
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Modulation : digital signals are converted to analogue signals Demodulation : analogue signals are converted to digital signals.
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- commonly used for LAN applications - has greater capacity to transmit data. Coaxial cable
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- Both voice and data signals can be carried on the same line. - data can travel very fast. Optical fibre
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microwave - Data can be transmitted via microwave radio signals. - The radio signal travels in a direct line from one relay station to the next.
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Microwave transmission is limited by line-of-signt
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satellite Satellites are launched into space to relay data communication.
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Three satellites can cover the Earth effectively
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Communication software Communication software is needed to enable computers with different configurations to send messages to each other
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Novell network A common communication software used in LAN is Novell.
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Network topology It describes how computers are connected together to form a network.
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Three major network topology 1. Star network 2. Ring network 3. Bus network
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Star network
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Ring network
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Bus network
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