Introduction to web based computing (2)

Introduction to web based computing (2) -...

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Unformatted text preview: 3-1IntroductionThere are three fundamental hardware components in a data communications network in addition to the network operating software:the servers or host computers, the client computers, the network circuits that connect them3-2Network Architectures There are three fundamental network architectures:Host-based networks: the host computer performs virtually all of the workClient-based networks: the client computer performs virtually all of the workClient-server networks: the work is shared between the hosts and clients3-3Network ArchitecturesThe work done by any application program can be divided into four general functions:data storagedata access logicapplication logicpresentation logic3-4Host-Based Architectures The very first data communications networks were host-based, with the host computer performing all four functions. The clients enabled users to send and receive messages to and from the host computer.This very simple architecture often works very well. Application software is developed and stored on one computer and all data are on the same computer.3-5Host-Based Architectures3-6Host-Based ArchitecturesThe fundamental problem with host-based networks is that the host must process all messages. In the late 1970s and early 1980s, intelligent terminals were developed that could perform some of the presentation function.3-7Client-Based Architectures In the late 1980s, there was an explosion in the use of microcomputers and microcomputer-based local area networks.Part of this expansion was fueled by a number of low-cost, highly popular applications such as work processors, spreadsheets, and presentation graphics programs.3-8Client-Based ArchitecturesWith client-based architectures, the clients are microcomputers on a local area network, and the host computer is a server on the same network....
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Introduction to web based computing (2) -...

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