交换机 Switch
路由器 Router
组件 Component
传输控制协议 TCP
互联网协议 IP
万维网 WWW
入侵检测和防御系统 IDPS
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
入侵检测系统 IDS
网络安全 Network Safety
开放系统互联 OSI
A LAN is used for communications in s small community in which resources, such as(printers),software,and servera,are shared. each device connected to(packets)data frames among multiple users of other local area networks. In LANs,(forward)are additional headers appended for local routing.These new-looking packets are known as(address).
As with most application-layer protocola,SMTP has two sides:a client side, which executes on the senders mail server, and a servee side, which executes on the recipients mail server.
互联网是一个互联的计算机网络组成的全球系统,他使用标准的互联网协议套件(TCP/IP)为全球数10亿用户提供服务。
As with most application-layer protocols, SMTP has two sides:a client aide,which executes on the senders mail server,and a server side,which executes on the recipients mail server.
与大多数应用层协议一样,smtp有两个方面:一个是在发送者的邮件服务器上执行的客户端,另一个是在接收者的邮件服务器上执行的客户端。
In the star topology,all users are directly connected to a central user through two unidirectional links:onefor uplink and the other for downlink.
在星型拓扑中,所有用户通过两个单向链路直接连接到一个用户中心:一个用于上行，另一个用于下行。
A computer network is a group of xomputers 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。