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 modelA.transportB.applicationC.networkD.physical
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.transport
B.application
C.network
D.physical
B.application
C.network
D.physical
参考解析
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。路由器（Router）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）,或物理层（physical layer），因此选C
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