未来网络之内容中心网络的挑战和应用

摘要

内容中心网络(CCN)是一种面向内容共享的通信架构.与传统基于IP地址的网络架构不一样,其可基于内容名字进行数据共享和交换,而不需要关心特定的物理地址和主机.采用发布/订阅传输模式和网络内置缓存,以存储换带宽,提高网络带宽利用效率.但该架构颠覆了现有互联网的基础,尚有很多问题亟待解决.重点介绍了内容中心网络的概念、特点、网络模型以及目前国际上的研究进展.尤其针对其面临的挑战和需要解决的关键问题进行了论述.同时,也列举了两个系统实现的样例,用以说明CCN的可行性和应用前景.%CCN is communication architecture that takes content as a primitive,and retrieves content by name,not by host IP again.It builds on publish/subscribe and network-embedded caching with bandwidth-storage tradeoff.Since it is a clean-slate design,there are many issues to be explored.The concepts,characteristics,network model and recent advances of CCN were introduced.The challenges and some key issues CCN faced were also emphasized.In order to demonstrate the feasibility and implementations,two CCN system samples were also presented.