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计算机
Refer to the exhibit. Assume that all router interfaces are operational and correctly configured. In addition, assume that OSPF
Refer to the exhibit. Assume that all router interfaces are operational and correctly configured. In addition, assume that OSPF
admin
2019-04-08
37
问题
Refer to the exhibit. Assume that all router interfaces are operational and correctly configured. In addition, assume that OSPF has been correctly configured on router R2. How will the default route configured on R1 affect the operation of R2?
选项
A、Any packet destined for a network that is not directly connected to router R1 will be dropped.
B、Any packet destined for a network that is not directly connected to router R2 will be dropped immediately.
C、Any packet destined for a network that is not directly connected to router R2 will be dropped immediately because of the lack of a gateway on R1.
D、The networks directly connected to router R2 will not be able to communicate with the 172.16.100.0, 172.16.100.128, and 172.16.100.64 subnetworks.
E、Any packet destined for a network that is not referenced in the routing table of router R2 will be directed to R1. R1 will then send that packet back to R2 and a routing loop will occur.
答案
E
解析
在R1上产生了一个OSPF的缺省路由,出接口指定为S0/0,这条缺省路由以5类LSA的形式通告给了R2,于是R2上也有了一条标记为O*E2 0.0.0.0/0 出接口为 Serial0/0的路由。所以R2收到任何路由表中没有的目的网段时,就将指定给R1,而R1根据缺省路由的出接口又将数据包发往R2,这样就形成了一个路由的环路。
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