OSPF协议把网络划分成4种区域（Area），存根区域（stub）的特点是（ ）。
- A.可以接受任何链路更新信息和路由汇总信息
- B.作为连接各个区域的主干来交换路由信息
- C.不接受本地自治系统以外的路由信息，对自治系统以外的目标采用默认路由0.0.0.0
- D.不接受本地AS之外的路由信息，也不接受其他区域的路由汇总信息
正确答案及解析
正确答案
解析
在划分了区域之后，OSPF网络中的非主干区域中的路由器对于到外部网络的路由，一定要通过ABR（区域边界路由器）来转发，既然如此，对于区域内的路由器来说，就没有必要知道通往外部网络的详细路由了，只要由ABR向该区域发布一条默认路由，告诉区域内的其他路由器，如果想要访问外部网络，可以通过ABR。这样在区域内的路由器中就只需要为数不多的区域内路由、AS中其他区域的路由和一条指向ABR的默认路由，而不用记录外部路由，能使区域内的路由表简化，降低对路由器的性能要求。这就是OSPF路由协议中“StubArea”（末梢区域）的设计理念。
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