Chapter 7 LAN Operating Systems

1. Chapter 7LAN Operating Systems • LAN Software • Software Compatibility • Network Operating System (NOP) Architecture • NOP Functions • NOP Trends

2. LAN Software • Network operating systems • Interface between hardware and application software • Application software: client front ends and server back ends or engines • Productivity software: e-mail, groupware etc. • Resource management software: security & monitoring

3. Vertical Software Compatibility • Common compatibility protocol • Types • Server: hardware drivers, OS, network operating system, DBMS, application back-ends, e-mail, groupware, distributed processing • Client: hardware drivers, OS, network operating system, database front-end, query tools, application tools, groupware, other network applications, distributed processing front-end, user interfaces

4. Horizontal Software Compatibility • Transparency between similar software layers between different client and servers • Use middleware • Database middleware • Network operating system middleware • Operating system middleware • Distributed application middleware

5. NOP Architectures • Peer-to-peer • Client/server • Current client/server

6. Peer-to-Peer NOSs • Traditional NOSs: LANtastic or PowerLAN • Printing & file sharing for less than 50 users • Workstation as service requester (client) and/or service provider (server • Lacking interoperability and scalability

7. Client/server NOSs • Client software and server software: Netware3.12 and Microsoft LANManager • Scalability, fast, reliability • Lacking interoperability

8. Current Trend of NOSs • Client NOSs: universal client • Server NOSs have performance characteristics • NetWare for file and printing servers • Windows NT, OS/2, UNIX for application servers • Small business NOSs • High-quality file and printing sharing service • DOS based, with minimal memory and disk requirement • Easy installation, configuration, and management • Dedicated 32-bit server software • Bundled workgroup software (chat, e-mail) • Easy migration to server-based NOSs

9. Client NOS • Windows 95, OS/2 Warp Connect, Windows NT Workstation • Functions • Operating system capabilities • Peer-to-peer networking capabilities • Client software to communicate with different server network operating systems

10. Client NOS - OS Capabilities • Desired characteristics • 32-bit OS • Preemptive multitasking • Protect memory space • Symmetrical multiprocessing (SMP) • Multithreading • User interface: object-oriented, windows

11. Client NOS - OS Capabilities • Application program support • Backward compatibility or legacy applications (16-bit) • 32-bit applications • Plug-n-play (PnP) features • PnP devices • PnP drivers • Reconfiguration

12. Client NOS - Peer-to-Peer Networking Capabilities • File and printer sharing • Workgroup application

13. Client NOS - Networking Capabilities • Multiple servers • Transfer protocols • Remote access • Laptop synchronization (with desktop) • Copy by date option: date range • Bidirectional option • Cloning option • Refresh option: existing files • Delta file synchronization: changes

14. Client NOS -Analysis • Hardware/platform • Required-recommended memory • 16 or 32 bit • User interface • Operating system capabilities • Peer-to-peer networking capabilities • Client networking capabilities

15. Sever NOSs - Types • UNIX • TCP/IP • NFS • NetWare • Windows NT

16. UNIX • Portability • Hardware platform • Application programs • Modularity

17. TCP/IP • Internet suite of protocols • De facto standard for communication between heterogeneous network computers

18. NSF - Network File System • Sun Microsystems • Allows multiple different computing platforms to share files • Between NetWare and Windows NT • Between UNIX workstations, minicomputers, and mainframe

19. NetWare • Applications • File server • Printing server • Global directory service: NetWare Directory Service (NDS) • Distributed • Replicated

20. Windows NT • Applications • Web server • Database server • Application server • Primary domain controller (PDC) • Domain directory service

21. Sever NOSs - Functions • Directory service • Directory interoperability • X.500 • Light-weight directory access protocol (LDAP) • Microsoft’s open directory services interface (ODSI) • Application services • Preemptive multitasking • 32-bit execution • Multithreaded application support • Program execution in protected memory space

22. Sever NOSs - Functions • File service • System management • SQL • Mail & schedule • SNA gateway to IBM mainframe network • Network clients services • DOS • Windows • Apple • OS/2 • UNIX or NFS

23. Sever NOSs - Functions • Network protocols supported • Multiprotocol routing • Remote access and gateway service • Management and administration service • Installation, configuration and administration • Integration and migration • Security: authentication, access rights • Audit trail and event logs • RAID

24. Sever NOSs Analysis • Hardware/platform • Installation and configuration • Networking and connectivity • Management and administration

25. Hardware/platform • Min/max memory • Min/max disk space • CPUs • Symmetrical multiprocessing • Preemptive multitasking • Multithreaded application support • Program execution in protected memory space

26. Installation and Configuration • Auto configuration • No. of NIC drivers

27. Networking and Connectivity • Clients supported • Protocols supported • Naming services • Remote access • E-mail gateway • Web browser • Messaging services

28. Management and Administration • Central management • SNMP for enterprise management • Audit trails and event logs • Security • RAID

29. Server NOS Trends • Symmetrical multiprocessing • Clustering and fault tolerance

30. Assignment • Review chapters 5-7 • Read Palmer: chapters 1-9 • Prepare exam 2