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问题 单项选择题

( ) 是局域网市场上曾居主导地位的网络操作系统，它推出时间比较早，运行稳定。

A．Windows 2000 Server

B．Windows NT Server

C．Linux

D．NetWare

答案

参考答案：D

解析： NetWare是由Novell公司于1983年推出的，是曾居局域网网络操作系统主导地位的一款操作系统。

单项选择题

（）is encoded with Differential Manchester in the diagram below.

A. 10110011100

B. I1001100011

C. 00111001101

D. 11000110010
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单项选择题

Typically, these are concern with the establishment of (66) the network and with the control of the flow of messages across this channel. The provision of such facilities is only part of the network requirements, however, since in many applications the communicating computers may be of different types. This means that they may use different programming languages and, more importantly, different forms of (67) interface between user(application)program, normally referred to, as application processes or APs, and the underlying communication services may be (68) For example, one computer may be a small single -user computer, while another may be a large (69) system. In the earlier days of computer communication, these issues meantthat only closed communities of computers ( that is, from the same manufacturer) could communicate with each other in a meaningful way. IBM’s Systems Network.
Architecture (SNA) and DEC’s Digital Network Architecture (DNA) are just two examples of Communication software packages produced by manufacturers to allow their systems to be int erconnected together. These proprietary packages, however, of which there am still many inexistence, do not address the problem of universal interconnect ability, or open systems interconnection. In an attempt to alleviate this problem, (70) , in the late 1970s, formulated a reference model to provide a common basis ( or the coordination of standards developments and to allow existing and evolving standards activities to beplaced into perspective with one another.

A．DNA

B．SNA

C．the OSI

D．the ISO
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