多选题Which of the following are characteristics of OSPF areas?（）AHierarchical OSPF networks need to be in one areaBMultiple OSPF areas must connect to area 0CSingle area OSPF networks must be configured in area 1DAreas can be assigned any number from 0 to 63535EArea 0 is called the backbone areaFEach OSPF area need to be configured with a loopback interface
多选题
Which of the following are characteristics of OSPF areas?（）
A
Hierarchical OSPF networks need to be in one area
B
Multiple OSPF areas must connect to area 0
C
Single area OSPF networks must be configured in area 1
D
Areas can be assigned any number from 0 to 63535
E
Area 0 is called the backbone area
F
Each OSPF area need to be configured with a loopback interface
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