2. 计算机
  3. 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

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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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