Basic Computer Networks ConfigurationsLearning ObjectivesNetwork Configurations?Basic configurationsSlide 5Terminal-to-mainframe configurationSlide 7Slide 8Microcomputer-to-mainframe configurationMicrocomputer-to-LAN configurationSlide 12Client/Server ProcessingFile Server Program AccessSlide 15Slide 16Comparing FSPA, Client/Server, and Terminal-to-mainframeComparing Distributed Processing Alternatives (Continued)Summary QuestionsSummary Questions (cont.)Slide 21Other slidesClient/Server processingPeer-to-Peer (P2P) network configurationP2P ApplicationsP2P network configuration w/ facilitating serverMicrocomputer-to-Internet configurationSlide 28Slide 29Slide 30Slide 31LAN-to-LAN configurationLAN-to-WAN configurationBasic Computer Networks ConfigurationsSchool of BusinessEastern Illinois University © Abdou Illia, Spring 2007Week 1, Thursday 1/10/2007)2Learning ObjectivesOutline Basic network configurationsName kinds of applications that might use each Configuration3Network Configurations?Ways to organize Data processing–Where to do processingDecision on “which configuration” depends on:–Available equipments–ApplicationsMany Basic configurations4Basic configurationsTerminal to mainframe computer Microcomputer to mainframe computer Microcomputer to local area network Microcomputer to Internet Local area network to local area network5Basic configurationsLocal area network to wide area networkWide Area network to Wide Area network Sensor to local area network Satellite and microwave Wireless telephone6Terminal-to-mainframe configurationCreated in the 1960s–Mainframe does all the processing–Terminals are dumb--only a remote screen and keyboard–Created in the 1960s, when microprocessors for terminal intelligence did not existUse in decrease (Legacy Systems)TerminalsMainframemodem modemTelephoneNetwork7Terminal-to-mainframe configurationUsually, Mainframe–Optimized for business uses--file access speed is more crucial than mathematical processingTerminals used for:–Entering data into system–Displaying results from the MainframeConfiguration used for: –Inquiry/Response applications–Interactive applicationsExamples: Airline reservation, Motor Vehicle licensing8Terminal-to-mainframe configurationMainframe controls:–Sending data to the terminals–Receiving data from the terminalsRequire special types of protocolsTransmission at relatively slow speed (e.g. 9600 bps)9Microcomputer-to-mainframe configurationBegan to emerge in the early 1980sUsually:–Mainframes store databases–Microcomputers perform operations on downloaded data–File Server Program Access is used (see next) for processing–Client/Server processing could also be used (see next)Can be used as a Terminal-to-Mainframe (w. Terminal-emulation cards)Example: Business employees accessing corporate database MicrocomputerMainframeData are downloaded to Microcomputer.Executed ThereUploaded toMainframe10Microcomputer-to-LAN configuration12Microcomputer-to-LAN configurationClient/Server processing system = one of the most common processing techniques used.13Client/Server ProcessingDivision of Labor–Client program handles lighter work, such as user interface chores and light processing chores–Server program handles heavy work, such as database retrievalClient Machine ServerClient ProgramServerProgram14File Server Program AccessFile Server Program Access is another Common Way to Execute Programs in Networks with Microcomputer-to-LAN configurations–Program files and Data files are stored on a file server before executionFile ServerClient PCStoredon theFileServer15File Server Program AccessFor execution,–Program and data files are downloaded (copied) to the Client PC–Processing on the client PC, not on the file server–File server merely stores programs and data filesFile ServerClient PCDownloaded toClient PC,Executed There16File Server Program AccessPC processing power limits FSPA programs–Client PCs do not get very large–Only programs small enough to operate on limited client PCs can be usedFile ServerClient PCExecuted on theClient PC17Comparing FSPA, Client/Server, and Terminal-to-mainframeFile Server Program Access Client/Server Processing Terminal–to-mainframe•Location of processing•Client PC (not on the file server)•Client computer and Server (2 programs)•Mainframe(terminals are dumb)•GraphicsVery good because of local processing in client PC•Very good because of local processing in client PC•Poor because rich graphics would require expensive high-speed network traffic.•Response Times•Very good because of local processing on client PC•Very good because of local process in client PC, although some server delay.•Poor because mainframes often are overloaded.•Scalability•Low: Client PCs do not get very large.•High: Upgrade the server.•Very high: Mainframes get very large18Comparing Distributed Processing Alternatives (Continued)File Server Program Access Client/Server Processing Terminal–to-mainframe•Platform independent?•No. For PCs only•Yes. Client and server machines may be of any platform type. The two machines may be of different platform types•No. For terminals and mainframes only19Summary Questions1. What kind of application might use: (a) a terminal-to-mainframe configuration, (b) a microcomputer-to-mainframe configuration, (c) client/server processing ? 2. Distinguish among Terminal–to-mainframe, File Server Program Access, and Client/Server processing in terms of where processing is done20Summary Questions (cont.)Which of the following may involve using a Terminal-to-Mainframe configuration?a) You are surfing the Web at home using a dial-up connection to the Internetb) You are downloading files located on a computer in your organization’s LAN using your laptop computer from home.c) The airline company clerk is booking for a flight ticket for a customer.21Summary Questions (cont.)Which of the following processing techniques is commonly used in schools’ LANs to provide software programs to students in computer labs?a) Client/server processingb) File Server Program AccessOther slides23Client/Server processingClient PC Client PC Client PC Client PCClient PCServer Does Heavy Processing Work: database retrieval, central security, etc.Client PCs do lighter work: creating requests, displaying responses24Peer-to-Peer (P2P)