● OSI is a theoretical model that shows how any two different systems can commun
● 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 (71) layer of the OSI model.
(71)
A.transport
B.application
C.network
D.physical
正确答案:C试题(71)分析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参考答案(71)C
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