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What is a lAN
a local area network, This type of network is used in places like schools and offices. It is spread over a small geographic area such as one or two buildings. The network links computers in the building together using network cables. The data is tran
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what is a WAN
A network which is spread across a wide geographic area is called a WAN. The Internet is the largest WAN there is.
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PSTN (Public Service Telephone Network)
• Uses telephone system to allow access to WANs and the Internet
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ADSL (Asymmetric Digital Subscriber Line)
• Transmits digital information at a high bandwidth down copper telephone cable.
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Fibre Optic Cable
Fibres of glass used to carry signals as pulses of light..Very high bandwidth.High level of security but expensive
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Cable
• Users who subscribe to a cable TV company can connect to the Internet using the cable connection and a cable modem
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Card 2

Front

A network which is spread across a wide geographic area is called a WAN. The Internet is the largest WAN there is.

Back

what is a WAN

Card 3

Front

• Uses telephone system to allow access to WANs and the Internet

Back

Preview of the back of card 3

Card 4

Front

• Transmits digital information at a high bandwidth down copper telephone cable.

Back

Preview of the back of card 4

Card 5

Front

Fibres of glass used to carry signals as pulses of light..Very high bandwidth.High level of security but expensive

Back

Preview of the back of card 5
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