一、计算机网络的发展由于客观实际应用的需要,以及高度发展的计算机技术、通信技术和信息处理技术的相互密切结合,推动了计算机网络的迅速发展。它经历了一个从简单到复杂、从低级到高级的发展过程。计算机网络的出现,改变了许多传统的习惯和概念,消除了空间和时间上的差异,使人们可以在远离计算机的地方共享各种计算机资源,从而给生产、科研和社会生活的各个方面带来深刻的影响。由于计算机网络综合了计算机、通信和信息处理等现代最新技术,所以它已成为衡量一个国家科学技术、工业水平和国防力量的重要标志,成为衡量一个国家的计算机、通信和信息处理水平的重要标志。计算机网络是把地理上分散的计算机系统、终端 First, the development of computer networks has driven the rapid development of computer networks due to the objective and practical application needs and the close combination of highly-developed computer technology, communication technology and information processing technology. It goes through a simple to complex, from low to high development process. The advent of computer networks has changed many traditional habits and concepts and eliminated spatial and temporal differences that allow people to share resources of various computers away from computers and bring about various aspects of production, research and social life profound impact. Since computer networks combine the latest modern technologies such as computers, communications and information processing, they have become an important indicator of a country’s science, technology, industry and defense capabilities and become an important measure of the level of a country’s computer, communications and information processing. . Computer networks are geographically dispersed computer systems and terminals