交换机——Switch 路由器——Router
组件——assembly 传输控制协议 ——TCP
互联网协议—— Internet Protocol 万维网 ——Web
入侵检测和防御系统 ——WWW
超文本传输控制协议—— HTTP 电子邮件—— E-mail
文件传输协议—— FTP 防火墙—— firewall
入侵系统检测——Intrusion system detection 网络安全 ——network security
开放系统互联 ——Open system interconnection
2. Choose the proper words to fill in the blanks.（选词填空）
A LAN is used for communications in a small community in which resources, such as address（ software）, and servers, are shared. Each device connected to a LAN has a unique（ frames）,Tivo or more LANS of the same type can also be connected to(Printers)data frames among siple users of other local area networks. In LANS, forword are additional headers appended for local routing. These new-looking packets are known as(packets)
Words to be chosen from：（可选词）
Packets, address, frames, printers, forward
faupslate the following English into Chinese.（将下面英语句子翻译为中文）(/)The Intemet is a global system of interconnected computer networks that use the standard Internet Protocol Suite (TCP/IP)to serve billions of users worldwide.
互联网是一个全球互联计算机网络系统，使用标准互联网协议套件（TCP/IP）为全球数十亿用户提供服务。(2)As with most application-layer protocols, SMTP has two sides: a client side, which executes on the senders mail server, and a server side, which executes on the recipients mail(m 00c oi ou adnalura fits ano server
与大多数应用层协议一样，smtp有两个方面：一个客户端在发件人邮件服务器上执行，另一个服务器端在收件人上执行
in the star topology, all users are die e nected to a central user woe woirectional links: one for uplink and the other for downlink
在星型拓扑结构中，所有用户都连接到一个中心用户的双向链路：一个用于上行，另一个用于下行
A computer network is a group of computers that are connected to each other for the purpose of communication.
计算机网络是为了通信而相互连接的一组计算机。
WANS are used to connect LANS and other types of networks together, so that users and computers in one location can communicate with users and computers in other locations.
广域网用于将局域网和其他类型的网络连接在一起，以便一个位置的用户和计算机可以与其他位置的用户和计算机通信