路由器包含多种端口以连接不同类型的网络设备，其中能够连接DDN、帧中继、X.25和PSTN等广域网络的是 （ ） 。
- A.同步串口
- B.异步串口
- C.AUX 端口
- D.Consol 端口
正确答案及解析
正确答案
解析
在路由器上，AUX端口就是异步端口，而serial端口是同步端口。
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