问题

Which of the following are characteris

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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参考解析：

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