【单选题】【消耗次数：1】
将传输比特流划分为帧，应属于下列OSI的哪一层处理？
①
物理层
②
数据链路层
③
传输层
④
网络层
参考答案：
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综合 OSI 和 TCP/IP 参考模型的优点，五层协议的体系结构，分别包含物理层、数据链路层、网络层、运输层和[填空]
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