【单选题】【消耗次数：1】
SDN架构不包括?
①
基础设施层
②
链路层
③
控制层
④
应用层
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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、[填空]、运输层和应用层
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