多选题OSPF routing uses the concept of areas. What are the characteristics of OSPF areas?（）AEach OSPF area requires a loopback interface to be configured.BAreas may be assigned any number from 0 to 65535.CArea 0 is called the backbone area.DHierarchical OSPF networks do not require multiple areas.EMultiple OSPF areas must connect to area 0.FSingle area OSPF networks must be configured in area 1.
多选题
OSPF routing uses the concept of areas. What are the characteristics of OSPF areas?（）
A
Each OSPF area requires a loopback interface to be configured.
B
Areas may be assigned any number from 0 to 65535.
C
Area 0 is called the backbone area.
D
Hierarchical OSPF networks do not require multiple areas.
E
Multiple OSPF areas must connect to area 0.
F
Single area OSPF networks must be configured in area 1.
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