一、引言所谓计算机网络(以下简称网络)是指将多台可独立工作的计算机通过一定的通信方式互连形成的资源共享系统,每台计算机是通过处理节点与线路进行连接的,每个节点之间可以自由交互信息,实现网络资源的拓展共享。网络等高科技产品的出现是现代社会发展的必然结果,也是以知识经济为核心的现代文明 I. INTRODUCTION The so-called computer network (hereinafter referred to as the network) refers to the resource sharing system formed by interconnecting a plurality of computers that can work independently through a certain communication method. Each computer is connected with the circuit through processing nodes and each node Can freely exchange information between them, and realize the expansion and sharing of network resources. The advent of high-tech products such as the Internet is an inevitable result of the development of modern society and also a modern civilization centered on the knowledge economy