现在人们常说“世界是多么的小”,是因为有了高速的运输工具 ,特别是信息高速公路 ,人们可以通过网络利用计算机方便地上网 ,与远隔万里的亲人、朋友通信、聊天 ;通过网络快捷地查阅和获取最新信息与资料 .信息高速公路的网络分为广域网和局域网 ,广域网中信息的传输是利用光纤 Now people often say “how small the world is” because of the high-speed means of transport, especially the information superhighway, where people can surf the Internet through computers and communicate with their loved ones and friends thousands of miles apart. By passing Internet quickly access and access to the latest information and information.The highway information network is divided into wide area networks and local area networks, the transmission of information in the wide area network is the use of optical fiber