By Sylvia Langfield, Dave Duddell

Cambridge foreign AS and a degree desktop technological know-how bargains an entire set of assets to accompany the 9608 syllabus. This coursebook grants an obtainable consultant to the theoretical and sensible abilities which are required by means of the path, with a transparent development of projects that consolidate and improve wisdom. It deals scholars particular descriptions of the recommendations, bolstered with examples that define complicated subject material in a transparent means. along basic definitions, better point programming talents are built throughout the rationalization of techniques and consolidated by means of useful exam-type questions for college kids to try.

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Before considering some of these, the representation used for an IP address needs to be introduced. During transmission, the technology is based on the 32-b it binary code for the address; for documentation purposes, a dotted decimal notation is used. Each byte is w ritten as the denary equivalent of the binary number represented by the binary code. 30 Classless inter-domain routing (CIDR} The first approach developed for improving the addressing scheme is called 'classless interdomain rout ing' (CIDR).

This technique approximated a grey tone by printing an array of black dots; varying the size of the dots changed the tone displayed. The technique, of course, relies on the limitations of the human eye which does not register the individual dots if they are suffic iently small. A variation of this technique is used in computer graphic presentation. Normally, neither screen nor printer technology can produce varying size dots but the same effect can be produced by varying the number of dots created in what can be described as a halftone cell.

As a result the naming system is hierarchical. g .. g. nl). The domain name is included in a universa l resource allocato r (URL), w hich identifies a web page, or an email address. A domain is named by the path upward from it. eng. com . com top-level domain (w hi ch is the reverse of that used for a pathname of a file). Look ing up a doma in name to find an IP address is called 'na m e resolution'. For suc h a query there are three possible outcomes: -- --- - - - - - - - -- ~ ---- ; - , - Chapter 2: Communication and ,lnternetTechnologies ~ If the doma in is under the jurisd iction of the server to which the query is sen t then an authoritative and correct IP address is returned.

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