Refer to the exhibit. Which statement describes DLCI 17?

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问题 Refer to the exhibit. Which statement describes DLCI 17?

选项 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.

答案C

解析 DLCI是在Frame-relay中的描述二层信息的地址,他的地位等同于以太网中的MAC地址。我们以R2上的DLCI 17来看,DLCI 17描述的是:从这个接口出去的目的地为R3的接口的这条PVC的二层的地址为17。
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