单选题When troubleshooting a Frame Relay connection, what is the first step when performing a loopback test?（）ASet the encapsulation of the interface to HDLCBPlace the CSU/DSU in local-loop modeCEnable local-loop mode on the DCE Frame Relay routerDVerify that the encapsulation is set to Frame Relay
单选题
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
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