r1 is the hub ， multipoint mode subinterface， r2 and r3 is spoke， when r2 down at the spoke， What will r1 react？how about r3？

Which two of these steps are minimum requirements to configure OSPFv3 under IPv6？（）

A. Configure a routing process using the command ipv6 router ospf [process-id].
B. Add the network statement for the interfaces on which OSPF will run.
Configure OSPF on the interface that it will run on.
D. Use the passive-interface command on the interfaces on which OSPF should not run.
Enable routing.

一个路由表，有3条，分别从rip，ospf，eigrp学过来的，到达相同目的，问路由选择哪条走？

On a multicast environment， what is process for installing and run an application on host？

OSPF的域间路由通告行为？问R1能够将AREA 1通告给AREA 0的域间路由在通告回AREA 1吗？为什么？

What are the three main types of networks that must be considered when defining a security policy？

当你配置AUTO-RP的时候会发生什么？

what does BGP neighbor in active state mean？

A default Frame Relay WAN is classified as what type of physical network?（）

A. point-to-point
B. broadcast multi-access
C. nonbroadcast multi-access
D. nonbroadcast multipoint.broadcast point-to-multipoint

端口安全，问violation什么模式仍然允许转发流量？