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- 单项选择题When troubleshooting a Frame Relay connection, what is the first step when performing a loopback test?（）
A、Set the encapsulation of the interface to HDLC
B、Place the CSU/DSU in local-loop mode
C、Enable local-loop mode on the DCE Frame Relay router
D、Verify that the encapsulation is set to Frame Relay
- A
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