計(jì)算機(jī)專業(yè)英語的課文與翻譯(編輯修改稿)
2025-05-01 01:50 本頁面
【文章內(nèi)容簡(jiǎn)介】 Most wide area networks, such as the PSTN, use a mesh (sometimes referred to as a network) topology. With LANs, however, the limited physical separation of the subscriber DTEs allows simpler topologies to be used. The four topologies in mon use are star, bus, ring and hub.The most widespread topology for LANs designed to function as data munication subnetworks for the interconnection of local puterbased equipment is the hub topology. It is a variation of the bus and ring. (2) Transmission mediaTwisted pair, coaxial cable and optical fibre are the three main types of transmission medium used for LANs.(3) Medium access control methodsTwo techniques have been adopted for use of the medium access control in the LANs. One is carriersensemultipleaccess with collision detection, and the other is control token.參考譯文局域網(wǎng)局域數(shù)據(jù)網(wǎng)(局域網(wǎng))由若干計(jì)算機(jī)組成。通常是一幢樓內(nèi)的工作設(shè)備被連接在一起。通過定義可知，這種連接一定是高速并且相對(duì)廉價(jià)的（如：令牌網(wǎng)和以太網(wǎng)）。例如，一個(gè)局域網(wǎng)可以把一幢樓里或像大學(xué)校園內(nèi)樓群里的各個(gè)辦公室的工作站連在一起。局域網(wǎng)是由精心挑選的各組設(shè)備（硬件和軟件）構(gòu)成的。它們根據(jù)組織的各種特殊需要來配置。局域網(wǎng)的大小一般限制在一個(gè)部門或者一個(gè)組織，由2～100臺(tái)電腦組成。局域網(wǎng)經(jīng)常包含一些資源，如一些服務(wù)器和打印機(jī)，而且可以通過網(wǎng)絡(luò)設(shè)備與其他的網(wǎng)絡(luò)連接。這些網(wǎng)絡(luò)設(shè)備包括交換機(jī)和路由器等。接下來，我們將討論不同類型局域網(wǎng)的結(jié)構(gòu)。(1) 拓?fù)浣Y(jié)構(gòu)大多數(shù)廣域網(wǎng)，如公共電話交換網(wǎng)（PSTN），使用網(wǎng)狀（有時(shí)稱為網(wǎng)絡(luò)）拓?fù)浣Y(jié)構(gòu)；而局域網(wǎng)由于用戶數(shù)據(jù)終端設(shè)備相距很近，可采用簡(jiǎn)單的拓?fù)浣Y(jié)構(gòu)。常用的有星形、總線、環(huán)形和集線器等4種拓?fù)浣Y(jié)構(gòu)。應(yīng)用最廣的、用于互連本部門計(jì)算機(jī)設(shè)備以進(jìn)行數(shù)據(jù)通信的局域網(wǎng)拓?fù)浣Y(jié)構(gòu)是集線器拓?fù)浣Y(jié)構(gòu)。這種拓?fù)浣Y(jié)構(gòu)是總線和環(huán)形拓?fù)浣Y(jié)構(gòu)的變種。(2) 傳輸媒體雙絞線、同軸電纜和光纖是局域網(wǎng)采用的3種主要傳輸媒體。(3) 媒體訪問控制方法局域網(wǎng)中采用了兩種媒體訪問控制技術(shù)，一種是載波偵聽多路訪問／沖突檢測(cè)技術(shù)（CSMA/CD），另一種是令牌控制技術(shù)。Text 4 InternetThe Internet is used by millions of people across the world to municate business and personal information. The Internet is huge. Then we will talk about the difference of “an internet” and “ the Internet”.An internet (note the lower case i) is a puter network. It allows puters with distinctive software and hardware to municate. Many kinds of puters can be connected to an internet. Each puter can serve a specialized role. It offers a wide variety of services to its users. The Internet is specific kind of internet. In The Internet Passport, the Internet will be defined as the network of networks. It follows a set of rules known as the Internet Protocol (IP) suite.But what does this mean to you? It means that any puter that is connected to the Internet can municate with any other Internet puter. From the user39。s perspective, this works much like the telephone system works. You can dial from your phone to any other phone on the system, no matter what kind of telepho
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