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
正确答案:D
答案解析:有
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