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Client/Server Computing

Client/Server Computing. Ajay Kumar Shrivastava. Network Operating System (NOS). It manages the services of the server It exists at the session and presentation layers of the client machine’s network management s/w. It provides the links to upper layer network management s/w.

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Client/Server Computing

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  1. Client/Server Computing Ajay Kumar Shrivastava

  2. Network Operating System (NOS) • It manages the services of the server • It exists at the session and presentation layers of the client machine’s network management s/w. • It provides the links to upper layer network management s/w. • It offers reliability, performance, security, and internetworking.

  3. Most popular LAN OS • NetWare from Novell • LAN Manager from Microsoft • OS/2 LAN Server from IBM • VINES from Banyan

  4. NetWare • NetWare Liteis the new member of the family. • It is DOS based NOS. • Designed for small offices and peer-to-peer systems. • NetWare can be used with bus or Token ring. • It can integrate DOS, OS/2, Macintosh, and UNIX clients on a network. • NetWare 3.11 supports TCP/IP and its native IPX/SPX protocol.

  5. LAN Manager • It works across multiple protocols, supporting NetBIOS or TCP/IP. • It supports the mainframe environment through its compatibility with IBM OS/2 LAN server. • It offers interoperability with NetWare through its NetWare connectivity program. • It requires that the server run on OS/2.

  6. LAN Manager Features • Concept of a domain • OS/2 named pipes facility • Support for multiprocessing • A preemptive scheduler • Remote access service

  7. OS/2 LAN Manager • IBM has added two enhancements -Aliases -Dynamic resource sharing • It facilitate the administration of large networks.

  8. VIrtual NEtworking System (VINES) • It is designed for large networks. • It can run over LANs server-to-server interconnections to provide a single, global view of the enterprise network. • It is based on a UNIX kernel. • VINES server can be a 286-486 machine running a POSIX – complaint version of UNIX System V. • VINES internet protocol (VIP) is a native protocol.

  9. Training

  10. Training advantages of GUI applications • Reduced training cost -Training cost by 30%-40% - Training Time 10 weeks to 4 weeks • Training the technical staff - Reduce the downtime - Overcome the Culture shock

  11. System administrator training • Should understand the requirement of System availability • Ease of user • Should ware of technical and human interaction protocols of working remotely.

  12. System administrator training • LAN administration • WAN administration • OS issues • PC/Workstation issues • Application issues

  13. Programmers resistance to new technology

  14. Database administrator training

  15. END user training • Workstation operations • Application and new technologies

  16. Training delivery technology

  17. C/S System Development Methodology • It describes a disciplined process through which technology can be applied to achieve the business objectives. • It describes the process through the entire life cycle. • Most integrator groups have their own life cycle management methodology.

  18. System Planning • Initiate system planning • Gather data • Identify current situation • Describe existing situation • Define requirements • Analyze applications and data architectures • Analyze technology platforms • Prepare implementation plan

  19. Project Initiation • Screen request • Identify relationship to long range • System plan • Initiate project • Prepare plan for next phase

  20. Architecture Definition • Gather data • Expand the requirements to the next level of detail • Conceptualize alternative solutions • Develop proposed conceptual architecture • Select specific products and vendors

  21. Analysis • Gather Data • Develop a logical model of the new application system • Define general information system requirements • Prepare external system design

  22. Design • Perform preliminary design • Perform detailed design • Design system test • Design user aids • Design conversion system

  23. Development • Set up development environment • Code modules • Develop user aids • Conduct system test

  24. Facilities Engineering • Gather data • Conduct site survey • Document facility requirements • Design data center • Plan site preparation • Prepare site • Plan hardware installation • Install and test hardware

  25. Implementation • Develop contingency procedures • Develop maintenance and release procedures • Train system users • Ensure that production environment is ready • Convert existing data • Install application system • Support acceptance test • Provide warranty support

  26. Post-implementation Support • Initiate support and maintenance services • Support hardware and communication configuration • Support software • Perform other project completion tasks as appropriate

  27. System integration life cycle 1 System planning 2 Project initiation 3 Architect-ure Definition System Encyclo. 4 Analysis 5 Design 6 Develop-ment 9 Post implementation support 8 Impleme-ntation 7 Facilities Engineeri-ng

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