A: To reduce the amount of flooding on broadcast media, such as Ethernet, FDDI, and Token Ring, the router gets full with only DR and BDR, and shows 2-WAY for all other routers.

• 答：量减少水浸对广播媒体，如以太网， FDDI和令牌环网，路由器得到充分只有医生和bdr ，并显示2路的所有其他路由器。