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单选题
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


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