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
正确答案:A,D,E
答案解析:有
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