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1、Unit 11 A. Text,TCP/IP Networks,New Words and Expressions,sophisticated sE5fistikeitid adj. 复杂的 remote ri5mEut adj. 远程的, 遥远的 chunk tFQNk n. 大块 datagram 5deitEgrAm n. 数据报, 数据包 interchangeably intE5tFeidVEbli adv.可交地, 可替交地 protocol 5prEutEkCl n. 协议, 草案 fund fQnd v. 支助, 投资,corporate 5kC:pErit adj. 公司的,
2、 社团的 mainstream 5meInstri:m n. 主流 transparent trAns5pZErEnt adj. 透明的 directory di5rektEri n. 目录 hierarchy 5haiErB:ki n. 层次, 层级 mount maunt v. 爬上,装上 configure kEn5fiE v. 配置, 设定 pass out of existence 不复存在,Technical Terms,packet switch 分组交换 protocol suite 协议族 TCP (Transfer Control Protocol) 传输控制协议 NFS
3、(Network File System) 网络文件系统,Notes,1. If you are managing a machine that has many users, each of whom may wish to simultaneously connect to remote hosts on a network, you need a way of allowing them to share your network connection without interfering with each other. 如果你正在管理一台有许多用户的机器，每个用户希望能同时连接到网
4、络上的远程主机，你需要一种允许他们互不干扰而分享网络连接的方式. 主句中 of allowing them 是介词短语作定语修饰 a way；each of whom 引导一个非限制性定语从句； remote hosts 译为：”远程主机” 。,2. When talking about TCP/IP networks you will hear the term datagram, which technically has a special meaning but is often used interchangeably with packet. 当谈论 TCP/IP 时你将会听到数据
5、报这个术语，这在技术上有其特定的含义但通常与分组交替使用。 which technically has 是一个非限制性定语从句；be used interchangeably with 译为：”与交替使用”。,3. It is another form of making the network transparent, because it basically allows you to treat directory hierarchies from other hosts as if they were local file systems and look like any other
6、 directories on your host. 它是使网络变得透明的另一种形式，因为它允许你像对待本地文件系统一样对待来自其它主机的目录，就象你自己的主机上的文件目录一样。 在 because 引导的原因状语从句中含一个 as if (似乎) 引导的方式状语从句, 并带双谓语 were 和 look like (像, 似 )。,4. Similarly, it is possible to share large amounts of data (such as a database, documentation or application programs) among many h
7、osts by maintaining one copy of the data on a server and allowing other hosts to access it. 同样地，通过维护服务器的数据拷贝和允许其它主机访问，使得在许多主机之间共享大量数据 (如数据库, 文档或应用程序）成为可能。 by maintaining access it 是介词短语作状语,注意该介词有两个宾语 maintaining 和 allowing，都是动名词形式。,. Try to match the following columns: 1. Transfer Control Protocol 网
8、际协议 2. Internet Protocol 局域网 3. interfere with each other 配置计算机 4. packet switch 远程主机 5. experimental network 相互干扰 6. Network File System 网络文件系统 7. Local File System 分组交换 8. Local Area Network 传输控制协议 9. remote host 实验网络 10. configure computer 本地文件系统,Exercises,1. 传输控制协议 2. 网际协议 3. 相互干扰 4. 分组交换 5. 实验网
9、络 6. 网络文件系统 7. 本地文件系统 8. 局域网 9.远程主机 10. 配置计算机,. Choose one word from the word list below to fill in the blank in each of the following sentences. Change the form of the word where necessary:,have a closer look at reference to packet switching packet-switched grew into configure your machine switchin
10、g experimental network 1.The approach that a large number of modern networking protocols use is called . 2.A network shares a single network link among many users by alternately sending packets from one user to another across that link.,packet switching,packet-switched,3.The ARPANET was an that was
11、converted into an operational one in 1975 after it had proven to be a success. 4.When ARPANET finally the Internet, the use of TCP/IP had spread to networks beyond the Internet itself. 5.It is difficult to read a newspaper or magazine now without seeing the Internet. 6.We will now the way TCP/IP wor
12、ks. 7.This information will help you understand how and why you have to . 8.The occurs as the datagram is carried across each link in the network.,experimental network,grew into,reference to,have a closer look at,configure your machine,switching,B. Reading Wave Division Multiplexing New Words and Ex
13、pressions demultiplex di5mQltipleks v. 解复用 corresponding 7kCris5pCndiN adj. 相应的, 通讯的 detector di5tektE n. 探测器, 检波器 capacity kE5pAsiti n. 容量, 生产量,Technical Terms,WDM (Wavelength Division Multiplexing) 波分复用 the modulated signal 已调制信号 optical transmission technology 光纤传输技术 end-to-end communication 端到端通
14、信 space division switching module 空分交换模式 point-to-point structure 点对点结构,Exercises,Decide whether the following statements are true or false: 1. After transmission, the source Signal arrives at the far end of the communication link to go through the separation or demultiplexing process. 2. The optica
15、l electrical conversion is still a must after the optical amplifier is added. 3. The Optical Path technology can improve the transmission capacity of lines and the throughput of nodes at the same time. 4. The transmission of 3.6 Tbit/s signal on 120km fiber lines has been successfully achieved in the laboratory. 5. The WDM transmission network consists of three layers: Physical Layer、Data Link Layer and Network Layer.,F F T F F,
