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Published byMichael Paul Modified over 9 years ago
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Chapter 7 LAN Operating Systems LAN Software Software Compatibility Network Operating System (NOP) Architecture NOP Functions NOP Trends
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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
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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
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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
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NOP Architectures Peer-to-peer Client/server Current client/server
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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
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Client/server NOSs Client software and server software: Netware3.12 and Microsoft LANManager Scalability, fast, reliability Lacking interoperability
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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
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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
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Client NOS - OS Capabilities Desired characteristics –32-bit OS –Preemptive multitasking –Protect memory space –Symmetrical multiprocessing (SMP) –Multithreading User interface: object-oriented, windows
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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
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Client NOS - Peer-to-Peer Networking Capabilities File and printer sharing Workgroup application
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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
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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
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Sever NOSs - Types UNIX TCP/IP NFS NetWare Windows NT
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UNIX Portability –Hardware platform –Application programs Modularity
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TCP/IP Internet suite of protocols De facto standard for communication between heterogeneous network computers
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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
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NetWare Applications –File server –Printing server Global directory service: NetWare Directory Service (NDS) –Distributed –Replicated
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Windows NT Applications –Web server –Database server –Application server Primary domain controller (PDC) –Domain directory service
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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
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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
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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
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Sever NOSs Analysis Hardware/platform Installation and configuration Networking and connectivity Management and administration
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Hardware/platform Min/max memory Min/max disk space CPUs Symmetrical multiprocessing Preemptive multitasking Multithreaded application support Program execution in protected memory space
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Installation and Configuration Auto configuration No. of NIC drivers
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Networking and Connectivity Clients supported Protocols supported Naming services Remote access E-mail gateway Web browser Messaging services
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Management and Administration Central management SNMP for enterprise management Audit trails and event logs Security RAID
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Server NOS Trends Symmetrical multiprocessing Clustering and fault tolerance
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Assignment Review chapters 5-7 Read Palmer: chapters 1-9 Prepare exam 2
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