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 considered a DTE deviceFA router is commonly considered a 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 considered a DTE device
F
A router is commonly considered a DCE device
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