CCNA题库解析 Refer to the exhibit.Assume that all of the router

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CCNA题库解析
Refer to the exhibit.Assume that all of the router interfaces are operational and configured correctly.How will router R2 be affected by the configuration of R1 that is shown in the exhibit?
A.Router R2 will not form a neighbor relationship with R1.
B.Router R2 will obtain a full routing table,including a default route,from R1.
C.R2 will obtain OSPF updates from R1,but will not obtain a default route from R1.
D.R2 will not have a route for the directly connected serial network,but all other directlyconnected networks will be present,as well as the two Ethernet networks connected to R1.
shangjuan T63

截图上看R1上的配置信息：
ip route 0.0.0.0 0.0.0.0 s0/0
一条默认路由指向S0/0 该路由的所有数据包都会通过S0/0转发出去.
default-information originate
向OSPF区域内广播一条默认路由,告诉别的路由数据包都转发给自己.
这种情况下,R2如果与R1邻居建立
R2收到一个数据包,查找路由表,根据R1广播的默认路由发送给R1了.
R1收到该数据包,查找路由表,又通过默认路由转发给R2,环路产生,这是不被允许的.
因此R1的错误配置导致无法与R2建立邻居

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