在广播网络中，OSPF协议要选定一个指定路由器（DR），指定路由器的功能是（ ）。
- A.发送链路状态公告
- B.检查网络故障
- C.向其他路由器发送最新路由表
- D.发现新增加的路由
正确答案及解析
正确答案
解析
为减少网络中的链路状态确认分组LSA泛洪传播，OSPF会在每一个网络中选举一个指定路由器 DR和一个备用指定路由器BDR。网络中的路由器都只与DR、BDR建立全相邻的邻接关系，其他路由器之间不会建立全相邻的OSPF邻接关系。在OSPF网络中，各路由器之间不直接两两发链路状态信息，而是通过选举DR/BDR，DR为主，BDR为备份DR，把链路状态信息发给DR/BDR，由DR在组播给所有非DR/BDR的路由器。
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