多项选择题
A.Router C will use ICMP to inform Host 1 that Host 2 cannot be reached
B.Router C will use ICMP to inform Router B that Host 2 cannot be reached
C.Router C will use ICMP to inform Host 1, Router A, and Router B that Host 2 cannot be reached
D.Router C will send a Destination Unreachable message type
E.Router C will send a Router Selection message type
F.Router C will send a Source Quench message type
单项选择题 Which IPV6 routing protocol uses multicast group FF02::8 to send updates?（）
多项选择题 What information does a router running a link-state protocol use to build and maintain its topological database?（）
多项选择题 OSPF routing uses the concept of areas. What are the characteristics of OSPF areas? （）