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1.引言随着计算机网络的普及,各种相关思想、理论、技术和产品层出不穷。人们正在看到,网络所采用的连接介质呈现为多样化(从电缆到光纤,从有线到无线);连接组件出现为多元化(连入网络的设备不再局限于个人电脑和工作站等传统意义上的计算机,还包括可移动的个人信息工具和通讯设备及带有嵌入式计算机的新型电子产品,如:便携式电话、数字相机、电视机顶盒
1. Introduction With the popularization of computer networks, various related ideas, theories, technologies and products are emerging in an endless stream. People are seeing the diversification of the connection media used in the network (from cable to optical fiber, from wired to wireless) to the diversity of connected components (network-attached devices are no longer confined to the traditional meaning of personal computers and workstations On the computer, but also includes mobile personal information tools and communications equipment and new electronic products with embedded computers, such as: cell phones, digital cameras, television set-top boxes