多项选择题
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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