What bit should be set in the link state PDUs in an IS-IS level-1-2 router to indicate that they are a potentialexit point out of the area ？（）
- A、ATT（Attached）bit
- B、IS-Type bits
- C、P（Partition）bit
- D、Down bit
- E、PN（Pseudonode）biy
- F、ABR（Area Border Rorter）bit
正确答案:A
答案解析:有
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