单选题Which of the following is an OSPF configuration parameter that is used on an ABR, but not on an internal router？（）AA virtual link to area 0.BOSPF summarization command.Cdefault - cost extension to the area command.Dno - summary extension to the area stub comm and.ENone of the other alternatives apply
单选题
Which of the following is an OSPF configuration parameter that is used on an ABR, but not on an internal router？（）
A
A virtual link to area 0.
B
OSPF summarization command.
C
default - cost extension to the area command.
D
no - summary extension to the area stub comm and.
E
None of the other alternatives apply
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