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

By Sylvia Langfield, Dave Duddell

Cambridge overseas AS and a degree desktop technology bargains an entire set of assets to accompany the 9608 syllabus. This coursebook can provide an obtainable consultant to the theoretical and sensible talents which are required by means of the path, with a transparent development of projects that consolidate and enhance wisdom. It deals scholars distinctive descriptions of the ideas, strengthened with examples that define advanced material in a transparent means. along basic definitions, better point programming abilities are constructed throughout the clarification of methods and consolidated by way of sensible exam-type questions for college students to try.

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

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Sub-netting A quite different approach, sub-net ting, allows further structure in t he addressing. To illustrate an example of this we can consider a medium-sized organisat ion with about 150 employees each w ith their own computer workstation. Let's assume that t here are six individual department LANs and one head-office LAN. 07 shows a schematic diagram of how the LANs wou ld be connected to the Internet if the original scheme were 1- - - - • C Cambridge International AS and A level Computer Science· used.

The technology that is cheapest to buy is the inkjet printer but t he purchase price is soon dwarfed by the cost of replacement ink. A genuine advantage of an inkjet printer is its relatively small size. The working principle of an inkjet printer is very simply explained: a sheet of paper is fed in; the pri nthead moves across the sheet depositing ink on to the paper; the paper is moved forward a fraction and the printhead carries out another traversa l and so on until the sheet has been fully printed .

In order for the client and server to cooperate, softwa re cal led 'midd leware' has to be present. This basic concept st ill hold s in present-day cl ient- se rver app lication s but the language used to describe how th ey operate has changed. • -- - Cambridge International AS and A level Computer Science The server is now a 'web server' which is a suite of software t hat can be insta lled on virtu ally any compu ter system . A web server provides access to a web application . The cl ient is the web browser software.

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