A.the cost between different routing protocols do not have comparable values

B.route different sources, its priority is not the same

C.the cost between different routing protocols have comparable values

D.next hop routing table is redundant, there is the interface can guide the packet forwarding

A.Change the work mode to full duplex of each end station.

B.Link the end stations together using a switch.

C.Change the work mode to half duplex of each end station.

D.Link the end stations together using a hub.