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A network operating system (NOS) is a computer operating system system that is designed primarily to support workstation, personal computer, and, in some instances, older terminal that are connected on a local area network (LAN). Artisoft's LANtastic, Banyan VINES, Novell's NetWare, and Microsoft's LAN Manager are examples of network operating systems. In addition, some multi-purpose operating systems, such asWindows NT and Digital's OpenVMS come with capabilities that enable them to be described as a network operating system.

The salient features of network operating systems are:

  • Basic operating system features support like protocol support, processor support, hardware detection and multiprocessing support for applications
  • Security features like authentication, restrictions, authorizations and access control
  • Features for file, Web service, printing and replication
  • Directory and name services management
  • User management features along with provisions for remote access and system management
  • Internetworking features like routing and WAN ports
  • Clustering capabilities

Common tasks associated with network operating systems include:

  • User administration
  • System maintenance activities like backup
  • Tasks associated with file management
  • Security monitoring on all resources in the network
  • Setting priority to print jobs in the network

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