Refer to the exhibit． Which statement describes DLCI 17?
A、
DLCI 17 describes the ISDN circuit between R2 and R3．
B、
DLCI 17 describes a PVC on R2． It cannot be used on R3 or R1．
C、
DLCI 17 is the Layer 2 address used by R2 to describe a PVC to R3．
D、
DLCI 17 describes the dial-up circuit from R2 and R3 to the service provider．
【正确答案】
C
【答案解析】
DLCI号是一个二层地址，和mac类似
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