2. 计算机
  3. Which of the following describes the roles of devices in a WAN?

Which of the following describes the roles of devices in a WAN?

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问题 Which of the following describes the roles of devices in a WAN?
选项 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
答案A,D,E
解析 SU/DSU是用于连接终端和数字专线的设备，属于DCE设备；
modem用于数字信号和模拟信号的转换，属于DCE设备；
路由器一般是DTE设备。
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