assignment 2 1. wong mun sim, sylvia (s970588) group member :
TRANSCRIPT
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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 computercan 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