OSI is a theoretical model that shows ho

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问题 OSI is a theoretical model that shows how any two different systems can communicate with each other.Router, as a networking device, operate at the (  ) layer of the OSI model.A.transportB.applicationC.networkD.physical

选项 A.transport
B.application
C.network
D.physical

答案 C

解析 OSI是Open System Interconnect的缩写,意为开放式系统互联。国际标准组织制定了OSI模型。这个模型把网络通信的工作分为7层,分别是物理层、数据链路层、网络层、传输层、会话层、表示层和应用层。
Router路由器,是运行在OSI中网络层network上的网络通信设备,而不是传输层transport layer,应用层application layer,及物理层physical layer,因此选C
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