計(jì)算機(jī)專業(yè)英語(yǔ)的課文與翻譯-展示頁(yè)
2025-04-13 01:50本頁(yè)面
【正文】 is a group of puters. The work devices connected together usually within the same building. By definition, the connections must be highspeed and relatively inexpensive (. token ring or Ethernet). For example, a LAN may be used to interconnect workstations distributed around offices within a single building or a group of buildings such as a university campus. LANs consist of carefully selected groups of ponents (hardware and software). They are configured for the specific requirements of the organization. A LAN is generally limited to the size of a department or an organization. And a LAN often consists of 2 to 100 devices. LANs usually contain resources such as servers, printers, and connections to other networks through internetworking devices. The internetworking devices include switches and routers.In the next section we will discuss the structure of the different types of LAN.(1) TopologyMost 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。現(xiàn)在我們知道，TCP/IP協(xié)議是因特網(wǎng)的基礎(chǔ)。應(yīng)用層包括所有高層協(xié)議。TCP表明是處于傳輸層，IP意為是在網(wǎng)絡(luò)層。(2) TCP/IP參考模型TCP/IP參考模型是一種傳輸協(xié)議，提供了許多不同的網(wǎng)絡(luò)服務(wù)。應(yīng)該注意的是，OSI模型本身并不是一種網(wǎng)絡(luò)體系結(jié)構(gòu)，它只是說(shuō)明每一層應(yīng)該做什么。然而，更多的協(xié)議是背離OSI模型的。(1) OSI參考模型OSI模型（開(kāi)放系統(tǒng)互聯(lián)參考模型）是由國(guó)際標(biāo)準(zhǔn)化組織（ISO）開(kāi)發(fā)的一個(gè)建議。網(wǎng)絡(luò)設(shè)計(jì)及其邏輯結(jié)構(gòu)應(yīng)該遵循一套設(shè)計(jì)原則，其中包括：功能的組織以及數(shù)據(jù)格式和過(guò)程的說(shuō)明。 However, more protocols deviate from the rules set up by the OSI model.The OSI model has seven layers. Note that the OSI model itself is not a network architecture. It just tells what each layer should do. However, ISO has also produced standards for all the layers. Each one has been published as a separate international standard.(2)
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