前言进入新的世纪,全球因特网高速发展。抓住机遇,迎接挑战,我国的网络建设方兴未艾,建网、用网的新高潮已经到来。网络诊断是管好、用好网络,使网络发挥最大作用的重要技术工作之一。首先简单介绍网络及路由器的基本概念,简述分层诊断技术,结合讨论路由器各种接口的诊断,综述互联网络连通性故障的排除。 Foreword Into the new century, the rapid development of the global Internet. Seize the opportunity to meet the challenges, the network construction in China is in the ascendant, building a network, the new climax of the network has arrived. Network diagnosis is one of the important technical work to manage and make good use of the network to make the network play a maximum role. First of all, we briefly introduce the basic concepts of network and router, briefly describe the layered diagnosis technology, and discuss the diagnosis of various interfaces of routers, and summarize the troubleshooting of Internet connectivity failures.