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-易过题库-题库最全的搜题网站

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

Atransport

Bapplication