A、The exchange of an advertisement is triggered by a change in the network.

B、All routers exchange routing tables with each other in a multipoint network.

C、Packets are routed based upon the shortest path to the destination.

D、Paths are chosen depending on the cost efficiency factor.

E、Every router in an OSPF area is capable of representing the entire network topology.

F、Only the designated router in an OSPF area can represent the entire network topology.