A.Backup port

B.Root port

C.Designated port

D.Alternate port

A.10

B.15

C.20

D.5

A.The Router ID must be manually configured

B.The Router ID must be the same in the same area, and the Router ID in different areas can be different

C.The prerequisite for the normal operation of the OSPF protocol is that the router has a Router ID

D.Router ID must be the IP address of an interface on the router

A.Cannot automatically adapt to changes in network topology

B.Low system performance requirements

C.Routers need to exchange routing information

D.Manual configuration by the network administrator

A.False

B.True