Which statement describes DLCI 17?

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.

Answer: C

Explanation:

DLCI stands for Data Link Connection Identifier. DLCI values are used on Frame Relay interfaces to distinguish between different virtual circuits. DLCIs have local significance because, the identifier references the point between the local router and the local Frame Relay switch to which the DLCI is connected.