计算机网络是计算机技术和通信技术紧密结合的产物,它涉及到通信与计算机两个领域。它的诞生使计算机体系结构发生了巨大变化,在当今社会经济中起着非常重要的作用,它对人类社会的进步做出了巨大贡献。从某种意义上讲,计算机网络的发展水平不仅反映了一个国家的计算机科学和通信技术水平,而且已经成为衡量其国力及 Computer network is a product of close combination of computer technology and communication technology. It involves both communication and computer. Its birth brought about a tremendous change in the computer architecture and played a very important role in today’s social economy. It has made a tremendous contribution to the progress of human society. In a sense, the level of development of computer networks not only reflects the level of computer science and communication technology in a country, but also has become a measure of its national strength and