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Chapter 1: Introduction to Client/Server IS

Chapter 1: Introduction to Client/Server IS. LAN LAN Hardware Components LAN Software Components LAN Connectivity Client/Server IS (C/S IS) Effective Analysis, Design and Implement of C/S IS C/S Connectivity and Compatibility C/S Analysis - business oriented Paradigm Shift

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Chapter 1: Introduction to Client/Server IS

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  1. Chapter 1: Introduction to Client/Server IS • LAN • LAN Hardware Components • LAN Software Components • LAN Connectivity • Client/Server IS (C/S IS) • Effective Analysis, Design and Implement of C/S IS • C/S Connectivity and Compatibility • C/S Analysis - business oriented • Paradigm Shift • Logical Architecture of C/S • Physical Architecture of C/S

  2. Local Area Network • Limited to a geographical area • owned, administrated and used by a single organization (not subject to FCC regulations) • support moderate data transfer rates with lower error rates • supports full connectivity among WS

  3. LAN Hardware Components • Network Interface Card • Server - types • Workstation • Hub, MAU, Concentrator, Switch • Connector • Cable • UPS

  4. LAN Software Components • Network Operating System • Backup Software • Workstation System Software • Network Application Programs

  5. LAN Connectivity

  6. Client/Server Information Systems • Client/Server Information System • Distributed IS • Organization’s Success • right information • right end user • right format • right place and time • right price

  7. Benefits of C/S IS • Resource Sharing • Communication • GroupWare • Management Control • Reduced Costs - downsizing • Support business environmental changes • Improved Information Accessbility • Faster/Better Information • Open Architecture - Compatibility Issues • Empowered Users

  8. Problems of C/S IS • Transition Costs • High cost of training, support • Multivendor architecture • Lack of management tools for distributed environment • Lack of standards • Technology not ready for missing critical application • Lack of software conversion tools

  9. Effective Analysis, Design, & Implmentation of C/S(1): Top-Down Approach

  10. Top-Down Approach: • Business • identifying business-level objectives • strategic business planning • BPR • Application • identifying information need • relating information needs to business process & opportunities

  11. Top-Down Approach: Effective Analysis, Design, & Implmentation of C/S(2) • Data • identifying data collection and distribution • data modeling • Network • network analysis & design • physical location data • data characteristics & compatabilities • data transfer • Technology • technology analysis

  12. Business Application Data Network Technology Business Requirements/Functions Application Design Database Design Network Model Logical Network Design Technology Model Physical Network Design Top-Down Approach

  13. Client/Server Connectivity and Compatibilities Issues • The OSI Model • Application • Presentation • Session • Transport • Network • Data Link • Physical

  14. Business-Oriented Client/Server Analysis • User Issues • # of users, their activities, security, support • Local Communication • required speed, distance to cover • Resource Sharing • # of printer, modems, etc • File Sharing • # of concurrent users

  15. Business-Oriented Client/Server Analysis • Distributed Data Access • database partition & allocation • Client/Server IS Management/Administration • personnel training • Extended Communication • internetworking

  16. Paradigm Shift

  17. People Architecture • Dawn of empowered user • Cross-functional, user department-based application development • MIS personnel in consultative roles • Changing role for centralized MIS department

  18. Logical Architecture of C/S IS • PAD Architecture • Presentation (User Interface) • Application (Processing) • Data (Data Manipulation)

  19. Figure 1-11 Presentation-Application-Data Logical Model

  20. Figure 1-12 Potential Categories of Elements of Client/Server Information Systems

  21. Characteristics of C/S IS • Client-based Presentation

  22. Figure 1-13 Presentation + Processing + Data Management = Logical Client/Server Architecture

  23. Characteristics of C/S IS • Transparency

  24. Characteristics of C/S IS • Scalability

  25. Characteristics of C/S IS • Interprocess Communication

  26. Figure 1-16 Distributed Processing Requires Interprocess Communications

  27. Characteristics of C/S IS • Database Distribution

  28. Figure 1-17 Key Components of Database Distribution

  29. Characteristics of C/S IS • Distributed Transaction Processing

  30. Figure 1-19 Local versus Distributed Transaction Process Monitoring

  31. Figure 1-20 The Top-Down Model and Logical Client/Server Architecture

  32. Physical/Technology Architecture • Client/Server Architecture vs. Mainframe/Terminal Architecture

  33. Figure 1-21b Client/Server versus Mainframe-Terminal Architectures

  34. Figure 1-21a Client/Server versus Mainframe-Terminal Architectures

  35. Figure 1-23 Example of an Enterprise Network Physical Topology

  36. Two Tierd vs. Three-Tiered CS Architecture • Two-tierd • Three-tierd

  37. Figure 1-24 Two-Tiered versus Three-Tiered Client/Server Architecture

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