Which of the following describes the roles of devices in a WAN (Choose three.)()。 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.
Which of the following describes the roles of devices in a WAN (Choose three.)()。
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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