多选题Which of the following describes the roles of devices in a WAN?（）AA CSU/DSU terminates a digital local loopBA modem terminates a digital local loopCA CSU/DSU terminates an analog local loopDA modem terminates an analog local loopEA router is commonly consideredaDTEdeviceFA router is commonly considereda DCE device
多选题
Which of the following describes the roles of devices in a WAN?（）
A
A CSU/DSU terminates a digital local loop
B
A modem terminates a digital local loop
C
A CSU/DSU terminates an analog local loop
D
A modem terminates an analog local loop
E
A router is commonly consideredaDTEdevice
F
A router is commonly considereda DCE device
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