电子商务chap02中文.ppt

Chapter 2 电子商务的技术基础 Technology Infrastructure The Internet and the World wide web Learning Objectives学习目标 In this chapter, you will learn about The origin growth and current structure of the internet 互联网的起源、发展和现状 How packet-switched networks are combined to form the internet 包交换网络构成互联网的原理 Internet protocols and Internet addressing 互联网协议和地址 The history and use of markup languages on the Web, including sgml, html and xml WWW标注语言的历史和应用,包括SGML,HTM and xml Learning Objectives学习目标 How hTML tags and links work on the world Wide Web HTML的标记和链接 The differences among internets intranets and extranets 互联网、内部网和外部网的区别 Options for connecting to the Internet including cost and bandwidth factors 接入互联网的各种方法以及各自的成本和宽带 Internet2 and semantic Web 第二代互联网和语义网 Technology Overview技术展望 Computer networks and the Internet form the basic technology structure for electronic commerce ·计算机网络以及互联网构成了电子商务的技术基础设 施 The computers in these networks run such software as 在这些网络中,计算机可以运行的软件有 Operating systems, database managers, encryption software multimedia creation and viewing software and the graphical user interface 操作系统、数据管理、加密软件、多媒体编程和浏览软件、以及 图形用户界面 Technology Overview技术展望 The internet includes:互联网包括: The hardware that connects the computers together and the hardware that connects the networks together 网络将计算机彼此连接在一起的技术,再将全球的计算机网络彼此 连接形成更大的网络 Rapid change in these technologies requires businesses to be flexible 这些技术的快速变化带来了商业上的柔性化发展 2.3 Packet-Switched Networks 包交换网 A local area network (LAN) is a network of computers lose togethe 距离较紧的计算机组成的网络叫做局域网 A wide area network (Wan) is a network of computers connected over a great distance 距离较远的计算机组成的网络叫做广域网 Circuit switching is used in telephone communication 网络化计算机的早期“线路交换模式”起源于电话通讯。 The Internet uses packet switching互联网使用包交换 Files are broken down into small pieces(called packets) that are labeled with their origin sequence, and destination addresses 在包交换网络中,文件信息被分解成小片断,称作包 这些包上标有表示源地址、次序和目的地地址的电子标签 Routing Packets路由数据包 The computers that decide how