Chapter 7 LAN Operating Systems

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Chapter 7LAN 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)
• Microsofts 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