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一、概述 21世纪是计算机网络的世纪,是深刻改变人类进程的世纪。计算机网络是计算机技术和通信技术密切结合的产物。任何企事业单位信息管理系统、办公自动化系统、商业自动化系统、生产科研系统、金融系统等都离不开计算机网络。计算机网络是现代高科技的重要组成部分。 计算机网络是由各种计算机和各类终端通过通信线路连接起来的复合系统。在这个复合系统中,由于硬件不同、连接方式不同及软件不同,网络中各结点间的通信很难顺利进行。由
I. Overview The 21st century is the century of computer networks and a century that profoundly changes the course of human beings. Computer network is a combination of computer technology and communication technology. Any enterprise information management system, office automation systems, commercial automation systems, production and research systems, financial systems are inseparable from the computer network. Computer network is an important part of modern high technology. Computer network by a variety of computers and terminals through the communication lines connected to the composite system. In this compound system, due to different hardware, different connection methods and different softwares, communication between nodes in the network is difficult to proceed smoothly. by