● OSI is a theoretical model that shows how any two different systems can communicate with

Question

● 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

Answer 1

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