Network survivability is the guarantee of supporting technology of network performance,which has a close connection with real deployment..It is an urgent need to solve the problem of network.Started with multilayer network technology survivability background, introduced the basic concept and method of network survivability,classified researched relevant key methods on this basis of concept and method.%网络生存性是保证网络性能的支撑技术,与实际网络应用的联系最为密切,是网络迫切需要解决的问题。本文从多层网络生存性的技术背景入手,介绍了网络生存性的基本概念和方法,在此基础上对相关关键方法进行了归类和研究。
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