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單項(xiàng)選擇題 Refer to the exhibit.Which statement describes DLCI 17？（）

A.DLCI 17 describes the ISDN circuit between R2 and R3.
B.DLCI17 describes a PVC on R2.It cannot be used on R3 or R1.
C.DLCI17 is the Layer 2 address used by R2 to describe a PVC to R3.
D.DLCI17 describes the dial-up circuit from R2 and R3 to the service provider.

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2.多項(xiàng)選擇題Which two statements describe the advantages to the use of RIP over the use of OSPF？（）

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5.單項(xiàng)選擇題What will an Ethernet switch do if it receives a unicast frame with a destination MAC that is listed in the switch table（）。

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