【单选题】【消耗次数：1】
（ ）是OSI参考模型的第3层，介于数据链路层和传输层之间。
①
物理层
②
网络层
③
传输层
④
数据链路层
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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]
【简答题】
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、[填空]、运输层和应用层
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