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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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