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Refer to the exhibit. S0/0 on R1 is configured as a multipoint interface to communicate with R2 and R3 in this hub-and-spoke Fra
Refer to the exhibit. S0/0 on R1 is configured as a multipoint interface to communicate with R2 and R3 in this hub-and-spoke Fra
admin
2019-04-08
38
问题
Refer to the exhibit. S0/0 on R1 is configured as a multipoint interface to communicate with R2 and R3 in this hub-and-spoke Frame Relay topology. While testing this configuration, a technician notes that pings are successful from hosts on the 172.16.1.0/24 network to hosts on both the 172.16.2.0/25 and 172.16.2.128/25 networks. However, pings between hosts on the 172.16.2.0/25 and 172.16.2.128/25 networks are not successful. What could explain this connectivity problem?
选项
A、The ip subnet-zero command has been issued on the R1 router.
B、The RIP v2 dynamic routing protocol cannot be used across a Frame Relay network.
C、Split horizon is preventing R2 from learning about the R3 networks and R3 from learning about the R2 networks.
D、The 172.16.2.0/25 and 172.16.2.128/25 networks are ov erlapping networks that can be seen by R1, but not between R2 and R3.
E、The 172.16.3.0/29 network used on the Frame Relay links is creating a discontiguous network between the R2 and R3 router subnetworks.
答案
C
解析
在帧中继的环境中默认的情况下,水平分割是关闭的。但是在子接口下,水平分割是打开的,因此从一个接口收到的路由是不会再从这个接口发出去的,因此R1的S0/0收到R3发过来的f0/0的路由,是不会再将这个条目从S0/0发出去的,因此R2将无法收到这个路由,同理R3也无法收到R2的f0/0的路由
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