By Graham Brown
This fresh textbook (with CD) has been particularly written to help CIE's most recent IGCSE in info and conversation know-how (0417). The authors are skilled examiners and academics, and produce a wealth of theoretical wisdom and useful event to either the publication and the CD, making sure that scholars are totally ready for either the written thought paper in addition to the 2 functional papers. each one component of the syllabus is totally coated within the textual content publication, with transparent factors and many projects and actions. The CD includes resource documents for the projects and actions, in addition to examination-style questions (with version solutions) and a thesaurus.
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Example text
It behaves like a mini-LAN. Wide area networks A wide area network (WAN) is basically formed by a number of LANs being connected together through either a router or a modem. Some companies will set up private WANs (usually by way of fibre optic cabling or telephone wires restricted to company use only). This is expensive but comes with the advantage of much enhanced security. It is more common to use an internet service provider (ISP) for connections to the internet and communicate via this network system.
2 Types of access The way data is stored and read by different backing storage devices varies considerably. This section briefly describes the two main methods of accessing data. Serial access With this system, to access data it is necessary to start at the beginning and then access each piece of data in turn until the required information is found. It is primarily used on magnetic tape systems and is a very slow form of access. It is used in applications where speed of access or A where the order in which the data is accessed is Old data stored not important, for example in utility billing, on magnetic tape New tape clearing bank cheques or producing pay slips.
TFT monitors cannot yet be used with light pens, so these monitors cannot be used in CAD if light pens are used to create and edit drawings. Laser printers Laser printers produce very high-quality hard copy output. The print rate per page is very quick if a large number of pages are being printed. They rely on large buffer memories, where the data for the whole document is stored before the pages can be printed out. g. in an office). They are the best option for fast high quality high volume printing.
