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Parallel transmission A number of bits of data are transmitted simultaneously over an equal number of channels It has a very short range

Serial Transmission Bits are transmitted one at a time over a single channel. This reduces the cost of cable, but makes data transmission slower. Also more complex, as bytes have to be disassembled into individual bits before transmission and reassembled after. Can be used over longer distances.

USB Universal Serial Bus is a serial transmission method introduced to make computer connections consistent

Bi-directional Transmission Transmitting in 2 directions. Fibre-Optics – light passes in one direction only, so extra fibres are added to the bundle to carry the signal in the opposite direction

The use of a scripting language to create code that provides interactivity on webpages Interaction takes place within the webpage and the code is downloaded to the users computer when the webpage is opened by the users browser. Example: A rollover image on a website Code is triggered when you move the move over a part of the webpage. Benefits: Speed: Faster as code has been downloaded with the page Security: More secure as all the action takes place on the page Disadvantages: Browser specific: Not all scripts work the same way on all browsers, so you have to create different versions Computer Speed: Can affect the speed of your computer as all the activity is taking place on a downloaded webpage.

The use of a scripts that reside and a re run on another computer on the internet. Info is submitted to the server, which processes it to provide results in the form of a webpage. Example: A good example is the submission of a search through a search engine. It matches the word or phrase against an index of website content on the server using scripts. Benefits: Efficiency: complex code can be run more efficiently, as it does not rely on the users computer Browser independent: can be run using any web browser Speed: If the server is speedy, the processing is speedy! Disadvantages: Security: Exchange of data over a network can present a risk Overloading: Server needs to be able to cope with large volumes of data