在计算机广域网中，（ ）是指通过由中间节点建立的专用通信我路来实现两台设备数据交换的技术。
- A.报文交换
- B.电路交换
- C.分组交换
- D.X.25交换
正确答案及解析
正确答案
解析
电路交换是指通过由中间节点建立的专用通信线路来实现两台设备的数据交换的技术。例如：PSTN、DDN 。
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