The LAN Operating System--Net Ware
Novell's Net ware has become the strongest competitor to IBM's own network operating environment and predates IBM in its support for LANs. In fact,IBM now markets Net ware for both the PC Network and for Token Ring in addition to its own software.The key to Net ware is the file server software and directories on the server are mapped to network drives, thus operating like virtual diskettes from a user's perspective. The server software is a multitasking operating system with a file structure consistent with DOS 2.x and DOS 3.x. The Net ware shell in each workstation intercepts 21H DOS calls and redirects appropriate calls to the server.
Perhaps the primary advantage of Net ware is that it runs on a wide variety of networking hardware.Regardless of whether you choose an IBM network, Corvus OMNINET, AT&T Star LAN, etc., you can obtain Net ware as the operating environment. In fact, if you have one of each the user will not be able to tell the difference(unless there are some distinct performance differentials), and they can be interconnected through Novell's system of bridges and gateways.
局域网
网络有两类:局域网(LANs)和广域网(WAN)。在这里主要谈一下局域网。
局域网就是在一个有限的地域范围内,典型的如在办公大楼或校园中,将计算机及相关外设(如打印机)用电缆进行物理连结而组成的一个系统。网络的拓扑结构可以是环形的、星形的或总线形的。在局域网中,可用光纤或同轴电缆连结多台计算机,且每台计算机的硬盘上必须装有专门的通信软件。允许具有不同平台的计算机共存于同一局域网中,且能进行数据交换的软件早已开发出来了。
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