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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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