Download e-book for iPad: Cambridge International AS and A Level Computer Science by Sylvia Langfield, Dave Duddell

By Sylvia Langfield, Dave Duddell

ISBN-10: 1107546737

ISBN-13: 9781107546738

Cambridge foreign AS and a degree machine technological know-how bargains an entire set of assets to accompany the 9608 syllabus. This coursebook grants an obtainable consultant to the theoretical and useful talents which are required by way of the path, with a transparent development of projects that consolidate and increase wisdom. It deals scholars certain descriptions of the options, bolstered with examples that define complicated material in a transparent means. along primary definitions, greater point programming talents are built during the rationalization of strategies and consolidated by way of sensible exam-type questions for college students to try.

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Additional info for Cambridge International AS and A Level Computer Science Coursebook

Sample text

A web server provides access to a web application . The cl ient is the web browser software. 09) . It is worth emphasising t hat the original uses of the web involved a browse r disp laying web pages wh ich contained information. There was provision fo r download ing of this info rmation but the web pages were essen t ially stat ic. For a client- server applicat ion, the web page is 'dynamic' which means t hat what is disp layed is determi ned by t he request made by the client. In this con text, t here is almost no limit to the variety of applications that can be supported .

Gateway --i•~! 07 Connecting LANs using the original classfu l 1Pv4 scheme The sub-netting solution for this o rganisation would require allocat ing just one Class C netlD. 255 where the netlD comp rises t he first three bytes, represented by t he decimal values 194, 10 and 9. The sub -netting now works by having a defined structure for the 256 codes constituting the host ID. A sensible solution for t his organisation is to use the top three bits as a code for the individual LANs and the rema ining five bits as codes for t he individual workstations.

For a client- server applicat ion, the web page is 'dynamic' which means t hat what is disp layed is determi ned by t he request made by the client. In this con text, t here is almost no limit to the variety of applications that can be supported . The only requirement is that t he application involves user interact ion . The most obvious examp les of a client-server application can be catego rised as 'ecommerce' where a custome r buys products online from a company. Ot her examples are: e-business, emai l, search ing library catalogues, on line ba nking or obtaining trave l t imet able informat ion .

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Cambridge International AS and A Level Computer Science Coursebook by Sylvia Langfield, Dave Duddell


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