【判断题】【消耗次数：1】
OSI模型的最底层是物理层。
①
正确
②
错误
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【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、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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