Which three statements about the traditional OSPF routing model are true? (Choose three)
A.
Networks running OSPF can be divided into areas.
B.
OSPF was designed to support hierarchical networks.
C.
A single area is a physical site or logical division of that site.
D.
All areas must be physically connected to the backbone area (Area 0)
E.
OSPF implementations consisting of multiple areas must be interconnected by a backbone area.
Explanation:
Not C: The area in traditional OSPF is a logical union of routers Not D: It is highly recommended that all areas are connected to the backbone are, but it is not obligatory. Using virtual link the area can be just logically be connected to the area 0.