單項選擇題
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