Which of the following describes the roles of devices in a WAN?（）A、A CSU/DSU terminates a digital local loopB、A modem terminates a digital local loopC、A CSU/DSU terminates an analog local loopD、A modem terminates an analog local loopE、A router is commonly consideredaDTEdeviceF、A router is commonly considereda DCE device
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 consideredaDTEdevice
- F、A router is commonly considereda DCE device
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