network - 1 Computer networks data communication and...

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1 Computer networks, data communication and Internet Introduction **** 2 Computer networks: summary The following gives an overview of computer networks and data communication: » The basic principles » Local area networks » National computers networks » International computer networks » The Internet » Future impact of digital communication networks ****
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3 Computer networks: prerequisites Before using computer networks, you should ideally have some knowledge and skills related to computer hardware computer software **** 4 Data communication: a definition Interpersonal communication » Telecommunication Broadcast Telephone Data communication Remote login File transfer Hypertext transfer Electronic mail ****
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5 Data communication: various views User (Applications) Database producer (Information) Engineer (Techniques) Sociologist (Sociological aspects) **-- 6 01 Digital information Multimedia / Hypermedia Data communication: which types of ‘data’? Linear text Hypertext Static images Video Sound Programs for computers ****
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7 Telecommunication: digital versus analogue Morse digital Telephone analogue (or digital) Data communication digital **-- 8 Data communication: which types of ‘data’? The same types of data (information) that can be stored and managed on a computer can be transferred over computer networks to one or several other computers. So the networks form an important extension of the stand-alone computers. “The network is the computer” ****
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9 Data communication: applications (Part 1) Hard-copy transfer (Fax) Online use of the processing power of a remote computer Online access to information sources ! » library catalogues, » bookshop catalogues, » publisher’s catalogues, » campus-wide and community information systems, » (text or multimedia) databases, » network-based journals, ... **** 10 Data communication: applications (Part 2) Software-downloading Electronic mail from a person to one or several persons Computer-network based interest groups Online talking / chatting (IRC,...) Video conferencing (Cu-seeme, ...) Selling, shopping, buying,.. ... ****
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11 Computer network applications: information and communication 1-way = information transfer = almost no interaction publications by e-mail / Internet radio file transfer (gopher) / core WWW based on http and static html pages network services based on databases (input or searches) e-mail communication / Usenet News chat / telephony / video conferencing N-way = communication = highly interactive ***- 12 **-- Computer networks: an analogy Traditional Letter Envelope Mail-box Post office Roads Networks Hypermedia Protocol Client Server Networks
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13 **--Example Computer network applications related to journalism Journalists search for information online.
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