下面哪个协议是基于VLAN进行生成树拓扑计算，并为每个VLAN生成一个连通的路径？

In OSPF, a Designated Router (DR) floods LSAs to all the routers on the segment that it has a neighbor relationships with. Over what kind of link does this happen and what kind of LSA type is sent?

哪种类型的OSPF网络需要手工指定OSPF邻居?

一台路由的FE口启用了OSFP，缺省情况下， 这个100Mbps的以太网接口的OSPF cost值是多少？

帧中继和ATM网络缺省的OSPF网络类型是什么？

OSPF中不能直接计算出路由的LSA是?

One of the WAN links on an OSPF has just gone down, causing a network topology change. What does an OSPF network do to maintain route consistency when it notices a change in the network?

OSPF中LSAck报文说法不正确的是：

关于OSPF的type1类和type2类外部路由说法不正确的为：

Which of the following are features are characteristics of an OSPF ABR

OSPF LSU报文中的LSAs字段说法正确的是：