GCSE ICT UNIT 2 - Exchanging information - wifi, bluetooth and GPS

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GCSE ICT UNIT 2 ( Exchanging information )


Wifi : communication technology that makes use of radio waves in order to connect to a local area network.

Each wifi enabled device searches for a wifi base station nearby. Once it finds the network you need to type in the correct password to connect. Some networks aren’t password protected and your device will automatically connect. Access points = hotspots . The wifi base station usually is a network router / ADSL modem. The router is often connected directly to the internet on a standard ADSL telephone line .

The max speed of a wireless network using 802.11g standard is 54mb/s but in reality they are often slower. A hard-wired gigabit network that can transmit 1000mb/s . Speed is mostly influenced by the strength of the radio signal – the weaker it is the slower the speed.

Usually wifi network have a range of 32m.

Wifi has many uses including : maps , to complete homework , google questions , to send files , to talk to people , to print , to watch films/ videos and to listen to music .

Advantages of wifi :

* Convenience – allows users to access network resources from nearly any location .

* Mobility – users can access internet outside their normal work environment .

* Productivity – users connected to a wifi network can maintain access to their work when they move to place . For a business this is useful as an employee can be more productive as their work can be completed for nearly any location
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* Deployment – setting up access points is a lot easier than have to pay for actual cables and get them fitted .

* Cost - less expensive as you don’t have to pay for the cables and for them to be fitted.

Disadvantages of wifi

* Security - even though its encryption , the data can still be hacked into .

* Range – the range isn’t that large (32m) . Large businesses will need many wifi points , the costs can quickly add up

* Reliability ...

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