Windows NT Server

Windows NT Server gives each program its own memory space. In addition it loads the DOS and Windows OS over the network onto the linked computers. It is unique in its security measurements, where normal users cannot install device drivers or change the networking protocols. It contains a New Technology File System (NTFS), which is a file system responsible for organizing files and storing them in a manner that facilitates their location and access. NTFS is unique in that it stores data changes to provide data recovery. It also allows access control to files and directories. In addition, it is capable of assessing attempts to access files, even if access is not granted.

Terms explaining the parts of a Windows NT Server as given by Windows NT Server Reference Version 0.6.0:

• “Enhanced Scalability- allows domains and trust relationships between domains to support WANs.
• Subnetwork- part of a network that may use one specific data link layer protocol such as ethernet.
• Network - a group of subnetworks that are connected using a bridge or switch.
• Intermediate distribution frame (IDF) is space for wiring in central closets which may be the central point of a star on a star network.
• Internetwork - networks connected using routers.
• Intranet- use of internet functions such as www, FTP, and gopher on internal networks.
• Logon authentication - restricts network access to users with a valid logon name and password.
• Backbone- high speed link that connects subnetworks.
• Bridge - connects different subnetworks
• Router - connects subnets with different topologies.
• Switch - subnetworks of the same or different topology may be connected depending on the type of switch.
• Write once, read many (WORM). A special type of optical hard drive used to record transactions and permanent data. Typically used by application servers.
• Write back caching - caching between the hard drive and a RAM buffer where data writes that are waiting in the cache can be read from the cache.
• Write through caching - caching between the hard drive and a RAM buffer where writes to disk cache are immediately written to the hard drive.”

VSE/ESA and z/OS

Two proprietary operating systems introduced by IBM to support mainframe computers. Both can support complex and large networks. z/OSe is a subcategory of z/OS that is designated for e-commerce and internet communications.

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