computernetworking摘要.ppt

华斌 Introduction to Networking Content of this course Background of Networking Data Communication OSI MODEL Local Area Network Wide Area Network TCP/IP 进度安排 Background one week 4 Data Communication one week 4 OSI MODEL three weeks 12 Local Area Network two weeks 8 Wide Area Network one week 4 TCP/IP one week 4 One： Introduction to Networking From the mode “computer center”to combine the technology of computer and the Communication,the development of computer network brings a very great progress of the human society。 “Networking is computer”，1997年11月，在美国拉斯维加斯全球计算机技术展览会上的口号代表了计算机网络技术发展的新纪元。 计算机网络发展史 面向终端的计算机通信网 分组交换网（画图） 形成计算机网络体系结构 高速网络技术 各阶段标志 分组交换：来自电话交换机原理，数字信号不连续、传输快而建立连接时间长。发展而来。 网络体系：首先是SNA（企业），不同设备要求而出现OSI。 Distributed Processing Networks use distributed processing,in which a task is divided among multiple computers.Instead of a single large machine being responsible for all aspects of a process,each separate computer hands a subset. Distributed Processing Networks use distributed processing,in which a task is divided among multiple computers.Instead of a single large machine being responsible for all aspects of a process,each separate computer hands a subset. Advantages of distributed processing Security Distributed Data Base Faster problem solving Security through redundancy(重复） Collaborative processing （协处理） Network Criteria（尺度） Performance:depends on the number of users,the type of transmission medium,the capabilities of the connected hardware,the efficiency of the software Reliability:Frequency of failure,Recovery time of a network after a failure,Catastrophe. Security:Unauthorized access,Viruses THE DEFINETION OF NETWORK： Data Communication Data communication is the exchange of data between two devices via some form of transmission medium. If the devices are very farther apart,the communication is called remote. Than,called local data communication. Tra