单选题Which of the following answers can be verified as true based on the following command output from Router R1?（） R1#show ip ospf virtual - links Virtual Link OSPF_VL0 to router 4.4.4.4 is up Run as demand circuit DoNotAge LSA alloweD. Transit area 1, via interface FastEthernet0/1, Cost of using 3AR1 is configured with an area 0 virtual - link 4.4.4.4 cost 3 command.BThe ping 4.4.4.4 command on R1 must currently be successful.CR1's Fa0/0 OSPF cost is 3.D4.4.4.4 is known to R1 based on a Type 1 LSA in area 1.
单选题
Which of the following answers can be verified as true based on the following command output from Router R1?（） R1#show ip ospf virtual - links Virtual Link OSPF_VL0 to router 4.4.4.4 is up Run as demand circuit DoNotAge LSA alloweD. Transit area 1, via interface FastEthernet0/1, Cost of using 3
A
R1 is configured with an area 0 virtual - link 4.4.4.4 cost 3 command.
B
The ping 4.4.4.4 command on R1 must currently be successful.
C
R1's Fa0/0 OSPF cost is 3.
D
4.4.4.4 is known to R1 based on a Type 1 LSA in area 1.
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