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多项选择题 Routers R1 and R2, OSPF neighbors in area 0 over their Fa0/0 interfaces (respectively), currently both successfully use OSPF MD5 authentication. The OSPF configuration includes the area 0 authentication command under the router ospf 1 command. Which of the following commands must have been configur ed on R1's Fa0/0 interface?()

A、ip ospf authentication null

B、ip ospf authentication message - digest

C、ip ospf authentication -key whatever- it - is

D、ip ospf message - digest - key 1 md5 whatever - it - is

E、ip ospf md5 1 key whatever - it - is

  • B,D
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