【文章內(nèi)容簡介】 址來為消息選擇最好的路徑。 this case, the router serves as the translator betweenthe information on your LAN and the ，路由器在局域網(wǎng)和互聯(lián)網(wǎng)絡間就作為信息傳遞的翻譯工具。一 Web has bee a very popular resource since it firstbecame possible ??自從1993年萬維網(wǎng)可以在一個世界范圍的電腦網(wǎng)絡因特網(wǎng)上瀏覽圖片和其他多媒體后，它就變成了一個非常流行的資源。 can read text, view pictures, listen to sound, and evenexplore interactive???.用戶可以在萬維網(wǎng)上讀文本、看圖片、聽聲音、甚至還可以探索交互式的虛擬環(huán)境。3.●The World Wide Web is the part of the internet that letsyou see information using words??..萬維網(wǎng)就是因特網(wǎng)中通過文字、圖片、聲音、顏色來得到信息的那個部分。 get to website you want, you need to use the correctUniform Resource Locator, or 。 World Wide Web has been the most popular developmentof the internet ???萬維網(wǎng)已經(jīng)成為因特網(wǎng)發(fā)展最快的一部分，他就像是由數(shù)百萬頁面組成的一本巨大的電子書，這些頁面就稱為主頁。6.●If you’ve never been on the internet before, you mightnot know what it is and how it really word“internet” describes the network that started in ,你可能不知道因特網(wǎng)是什么，它是怎樣工作的，,在1983年因特網(wǎng)描述了網(wǎng)絡工作。 many methods focus on ordering information orputting information in a hierarchy, hypertext focuses oncreating relationships between ，而不像其他許多方法關注于把信息排序或是分層次(hypertext markup language)describes a web page,which is stored in a plain text file with HTM or HTML fileextension..HTML用來生成一個網(wǎng)頁，他們被保存在以HTM或HTML為文件擴展名的純文本文件里。 primary purpose of HTML is to describe how to formatthe text content of a web pageHTML的主要作用是描述一個網(wǎng)頁的文本內(nèi)容的格式。二 detection and correction are required incircumstance where errors cannot be ，如一些錯誤是不可接受的時候需要檢錯糾錯功能 properties of the signal, such as form and intensity,must be such that they are :(1)capable of being propagatedthrough the transmission system ,and(2)interpretable asdata at the ，例如他的形態(tài)和強度必須是：（1）能夠經(jīng)過傳輸系統(tǒng)的；（2）能夠為接收端接收并識別的。, the transmission system may it itself be a networkthrough which various path may be ，傳輸系統(tǒng)本身也可以是一個供不同路徑通過的網(wǎng)絡。 formatting has to do with an agreement between twoparties as to as form of the data to be exchanged ortransmitted, such as the binary code for ，這個協(xié)議就是關于數(shù)據(jù)的交換和傳輸形式兩方面的，例如他的形式是字符的二進制編碼。5．Receiver will attempt to estimate the original s(t),basedon r(t)and its knowledge of the medium ,producing a sequenceof bits g(t)。接收器將在r(t)和它的傳輸媒介的基礎上對原始信號s(t)進行測試，并產(chǎn)生一個順序脈沖g(t)。 is usually the case that the LAN is owned by the sameorganization that owns the attached devices ??..通常情況下，某一機構(gòu)擁有局域網(wǎng)及其附屬設備，而對廣域網(wǎng)，這種情況很少，或者網(wǎng)絡中至少有一小部分是沒有所屬權的。 WANs have been implemented using one of twotechnologies: circuit switching and packet switching???傳統(tǒng)上，WANs實施使用兩項技術當中的一個：電路交換和包交換。最近，幀中繼和ATM網(wǎng)絡擔任主要角色。 personal puter is connected to some transmissionmedium, such as local network or a telephone line, by an I|Odevice , such as a local network transceiver or a ,如局域網(wǎng)或一根電話線,通過I| O設備,如本地網(wǎng)絡收發(fā)或調(diào)制解調(diào)器。三The physical and network access layers provide interactionbetween the end system and the network???物理和網(wǎng)絡訪問層提供了終端系統(tǒng)和網(wǎng)絡之間的交互作用，在這里傳輸和應用層提供的是端到端的協(xié)議。1． The File Transfer Protocal(FTP)is used to send files fromone system to another under user mand ??.文件傳輸協(xié)議(FTP)常用一個用戶命令把文件從一個系統(tǒng)傳到另一個系統(tǒng)，他可以傳送文本和二進制文件，并且還提供控制用戶訪問的協(xié)議。2． Two protocol arc