论文部分内容阅读
引言随着计算机技术、通讯技术和信息处理技术的发展,计算机从单机进入网络化时代。为了使各种不同的信息处理系统之间能方便灵活地互连通信,必须制定广泛遵循的网络协议标准,这是一项全球性的工作。目前这项工作在国际标准化组织ISO主持下已经取得了令人瞩间的成就。从1978年提出OSI开放系统互连七层参考模型至今,经过多年细致的研究,每一层协议都有了相对稳定和较为成熟的标准。目前,OSI的工作已得到了各国有关部门和各大集团的支持和接纳,其协议的实施应用也是大势所趋。MAP/TOP协议的制定和用户协会的成立,有力地加速了OSI协议的应用进程。比较而言,面向通信处理的OSI低层(运输层及以下三层)协议的研究制定已取得了较为完善的结果,公布了相应的国际标准IS文本,
INTRODUCTION With the development of computer technology, communication technology and information processing technology, the computer has entered the network age from stand-alone. In order to enable easy and flexible interconnection of communications between various information processing systems, it is imperative that standards for network protocols be widely followed and that this is a global effort. At present, this work has made remarkable achievements under the auspices of the International Organization for Standardization (ISO). Since 1978, OSI open system interconnection seven reference model has been proposed so far, after years of meticulous research, each protocol has a relatively stable and more mature standards. At present, the work of OSI has been supported and accepted by the relevant departments and major groups in various countries. The implementation and application of the agreement is also the trend of the times. The establishment of the MAP / TOP protocol and the establishment of user associations have effectively accelerated the application process of the OSI protocol. In comparison, the research and development of the OSI lower layer (transport layer and the following three layers) oriented to communications processing has achieved relatively good results and published the corresponding international standard IS texts,