CCNA第二学期练习题七.doc

1 请参见图示。如果所有路由器都运行RIP第2版，为什么没有192.168.1.32/27网络的路由？ Refer to the exhibit. If all routers are running RIP version 2, why is there no route for the 192.168.1.32/27 network? 3 Rip第2版不会在更新中发送子网掩码。 Rip version 2 does not send subnet masks in its updates. 路由器A并未将RIP设置为路由协议。 Router A is not setup with RIP as a routing protocol. Rip第2版默认将自动总结路由。 Rip version 2 will auto summarize routes by default. 路由器B未设置为通告192.168.1.64/30网络。Router B is not setup to advertise the 192.168.1.64/30 network. 2 请参见图示。下列哪个路由器上的哪条命令可让Router1获知192.168.0.0/20网络？ Refer to the exhibit. Which command on which router will allow Router1 to learn about the 192.168.0.0/20 network? Router1(config)# ip classless Router1(config-router)# no passive-interface serial 0/1/1 Router2(config-router)# version 2 Router2(config-router)# neighbor 10.0.0.2 3、哪两项是选择实施RIP第2版而不是RIP第1版的原因？（选择两项。） What are two reasons to implement RIP version 2 rather than RIP version 1? RIP第2版支持VLSM。 RIP第2版支持16台以上的路由器。 RIP第2版支持有类（而不是无类）路由 RIP第2版支持路由更新验证。 RIP第2版支持多区域。 RIP第2版使用Dijkstra算法而不是贝尔曼-福特算法。 4RIP v1和RIP v2的相似点有哪些？（选择三项。） How are RIP v1 and RIP v2 similar to one another? 两者都使用跳数作为度量。 They both use hop count as a metric. 两者对无穷距离使用相同的度量值。 They both have the same metric value for infinite distance. 两者都向邻居广播其更新。 They both use a broadcast IP address to send updates to their neighbors. 两者都在更新中发送子网掩码信息。 They both send subnet mask information in their updates. 两者都对更新来源进行身份验证。 They both provide for authentication of update sources. 两者都使用水平分割来防止路由环路。 They both use split horizon to prevent routing loops. 5 请参见图示。路由器East和West被配置为使用RIPv1。两台路由器都会发送有关其直连路由的更新。East路由器可以ping通West路由器的串行接口，West可以ping通East的串行接口。但是，两台路由器都无法从对方动态获知路由。最可能的原因是什么？ Refer to the exhibit. Routers East and West are configured using RIPv1. Both routers are sending updates about their directly connected routes. The East router can ping the West router serial interface and West can ping the serial interface of East. However,