Unit7-Computer Network

计算机英语(第四版)刘艺 王春生等编

Unit 7 Computer Network 第7单元 计算机网络Section A Network Fundamentals 课文A 网络基本原理

刘晓璐 讲师

计算机英语(第四版)刘艺 王春生等编

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。Unit7 Computer Network 2

计算机英语(第四版)刘艺 王春生等编

In these networks, computer users can exchange messages and share resources— such as printing capabilities, software 插入语 packages, and data storage facilities—that are scattered throughout the system.定语从句，修饰resources

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。

Unit7 Computer Network

计算机英语(第四版)刘艺 王春生等编

The underlying software required to support such applications has grown from simple utility packages into an expanding system of network software that provides a sophisticated network wide infrastructure.underlying[, nd la ]adj.潜在的;基础的;表面下的 sophisticated[s f st ke t d]adj.(机器、装置等)高级 的,精密的;(方法)复杂的 infrastructure[' nfr str kt (r)]n.基础设施；基础建 设 支持这类应用所需的基本软件，已经从简单的实 用软件包发展成一个不断扩展的网络软件系统， 该系统提供了一个复杂的网络范围的基础结构。Unit7 Computer Network 4

计算机英语(第四版)刘艺 王春生等编

In a sense, network software is evolving into a network wide operating system. evolve into…逐渐发展(进化、演变)成… 从某种意义上说，网络软件正在演变成一 个网络范围的操作系统。

Unit7 Computer Network

计算机英语(第四版)刘艺 王春生等编

I. Network ClassificationsA computer network is often classified as being either a local area network (LAN), a metropolitan area network (MAN), or a wide area network (WAN).

metropolitan[,metr 'p l t n]adj.大都会的；大 城市的；宗主国的；大主教教区的 一、网络分类 计算机网络常常划分为局域网、城域网 和广域网。Unit7 Computer Network 6

计算机英语(第四版)刘艺 王春生等编

A LAN normally consists of a collection of computers in a single building or building complex. For example, the computers on a university campus or those in a manufacturing plant might be connected by a LAN. complex综合建筑群;综合大楼 plant工厂;成套设备 局域网通常由一幢建筑物或一个建筑群中的 若干计算机组成。例如，大学校园里的计算 机或制造工厂中的计算机可以用局域网连接。Unit7 Computer Network 7

计算机英语(第四版)刘艺 王春生等编

A MAN is a network of intermediate size, such as one spanning a local community. A WAN links machines over a greater distance—perhaps in neighboring cities

or on opposite sides of the world. span[spæn]vt.跨越;遍及 community[k 'mju:n t ]n.社区;社会团体;群落 城域网属于中型网络，如一个覆盖某一社区 的网络。广域网连接地理范围更广的计算机， 这些计算机或许在相邻的城市，或许在地球 相反的两面。Unit7 Computer Network 8

计算机英语(第四版)刘艺 王春生等编

Another means of classifying networks is 宾语从句 based on whether the network’s internal operation is based on designs that are in the public domain or on innovations owned and controlled by a particular entity such as an individual or a corporation.

domain[d 'me n]n.范围，领域； innovation[ n 've n]n. 革新，创新网络分类的另一种方式是根据网络的内部 运行是基于无专利权保护的设计还是基于特定 实体(如个人或公司)所拥有和控制的革新。Unit7 Computer Network 9

计算机英语(第四版)刘艺 王春生等编

A network of the former type is called an open network; a network of the latter type is called a closed, or sometimes a proprietary network.

proprietary[pr 'pra tr ]adj.专有的，专利的前一种类型的网络称为开放式网络，后一 种类型的网络称为封闭式网络，有时也称 为专有网络。

Unit7 Computer Network

计算机英语(第四版)刘艺 王春生等编

The Internet is an open system. In particular, communication throughout the Internet is governed by an open collection of standards known as the TCP/IP protocol suite. Anyone is free to use these standards without paying fees or signing license agreements. suite[swi:t]n.[计](软件的)套件 因特网 属于开放式系统。尤其是，整个 因特网的通信是由一组称为TCP/IP协议组的开 放标准来控制的。任何人都可以自由地使用这 些标准，而不需要付费或签署许可协议。Unit7 Computer Network 11

计算机英语(第四版)刘艺 王春生等编

In contrast, a company such as Novell Inc. might develop systems for which it chooses to maintain ownership rights, allowing the company to draw income from selling or leasing these products.Inc. (缩写)incorporated (责任有限)公司 lease[li:s]vt.出租; 租借 income[ nk m] n.收入，进款；

相反，像Novell股份有限公司这样的公司可能 选择为其开发的系统保留所有权，通过出售或 出租 …… 此处隐藏：2780字，全部文档内容请下载后查看。喜欢就下载吧 ……