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  3. The Frame Relay network in the diagram is not functioning properly． What is the cause of the problem?

The Frame Relay network in the diagram is not functioning properly． What is the cause of the problem?

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问题 The Frame Relay network in the diagram is not functioning properly． What is the cause of the problem?
选项 A、The Gallant router has the wrong LMI type configured．
B、Inverse ARP is providing the wrong PVC information to the Gallant router．
C、The S3 interface of the Steele router has been configured with the frame-relay encapsulation ietf command．
D、The frame-relay map statement in the Attalla router for the PVC to Steele is not correct．
E、The IP address on the serial interface of the Attalla router is configured incorrectly．
答案D
解析 这个图中的PVC建立有问题的，先看Gallan的map映射：只有到Steele：172．31．31．126的映射；再来看Steele的映射：也只有到自己的映射，所以Gallan到Steele的连通性就有问题了，Gallan可以将包发送到Steele，但是Steele回包的时候无法完成封装，连通性失败了。而且他们两个
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