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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 considered a DTE device.

F、A router is commonly considered a DCE device.

  • A,D,E

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