OSIisatheoreticalmodelthat（2010年下半年系统集成项目管理工程师上午综合知识真题解析）
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
参考答案： C
参考解析：正在整理中,欢迎在文下评论区提供答案解析,谢谢！