简述TCP/IP中物理层的功能。
TCP/IP中的物理层定义了数据传输设备(如工作站、计算机)(2分)和传输媒体或网络间的接口。(2分)涉及对于传输媒质特性、信号特性、数据速率(2分)和相关内容的确定。(1分)
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