A. Areas introduce a boundary on the link - state updates.
B. Areas are  logical definitions specific to any given router.
C. All routers within an area have the exact link - state database.
D. The calculation of the Dijkstra algorithm on a router is limited to changes within an area.
E. The area designated router will always  have a priority of 0.

A.show ip ospf
B.show ip ospf interface
C.show ip ospf neighbor
D.show ip ospf database
E.show ip ospf statistics
F.show running - config  begin router ospf