2. 计算机
  3. A network administrator is configuring the routers in the graphic for OSPF． The OSPF process has been started and the networks h

A network administrator is configuring the routers in the graphic for OSPF． The OSPF process has been started and the networks h

admin2019-04-08  29
问题 A network administrator is configuring the routers in the graphic for OSPF． The OSPF process has been started and the networks have been configured for Area 0 as shown in the diagram． The network administrator has several options for configuring RouterB to ensure that it will be preferred as the designated router (DR) for the 172．16．1．0 /24 LAN segment． What configuration tasks could be used to establish this preference?
选项 A、Configure the priority value of the Fa0/0 interface of RouterB to a higher value than any other interface on the Ethernet network．
B、Change the router id of Router B by assigning the IP address 172．16．1．130/24 to the Fa0/0 interface of Router B．
C、Configure a loopback interface on RouterB with an IP address higher than any IP address on the other routers．
D、Change the priority value of the Fa0/0 interface of RouterB to zero．
E、Change the priority values of the Fa0/0 interfaces of RouterA and RouterC to zero．
答案A,C,E
解析 OSPF中的共享介质下是需要选举DR和BDR的，而这个选举的过程是通过比较优先级和RID来实现的。优先级越高的越优先选举成为DR，优先级为0的接口是不参加DR的选举的，如果优先级相同就比较他们的RID,RID越大的越优先。RID的选举过程是：手工指定的最为优先，如果没有手工指定RID，则比较路由器上活动接口的IP地址，如果有回环口就选用回环口IP地址最大的地址作为RID,如果没有回环口，就选用物理接口地址中最大的IP地址为RID这个题中需要确保Router B成为网络172．16．1．0/24的DR，根据上面的解释可以看出，让他成为DR的方式有：改Router B的f0/0的优先级为最大的；改172．16．1．0/24网段上的其他接口的优先级为0;设置Router B的RID最大。
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