Unit 8 Computer Network 第八单元： 计算机网络
Section A Network Fundamentals
课文A： 网络基本原理 The need to share information and resources among different computers has led to linked computer systems, called networks, in which computers are connected so that data can be
transferred from machine to machine.
在不同计算机之间共享信息和资源的需要，导致了相互连接的计算机系统的产生。这种相互连接的计算机系统被称为网络。在网络中，计算机连接在一起，从而数据可以从一台计算机传输到另一台计算机。
In these networks, computer users can exchange messages and share resources - such as printing capabilities, software packages, and data storage facilities - that are scattered throughout the system.
在网络中，计算机用户可以交换信息，并共享分散在整个网络系统的资源，如打印能力、软件包以及数据存储设备。
The underlying software required to support such applications has grown from simple utility packages into an expanding system of network software that