Ethernet switch can access all kinds of terminal devices, set up LANs and achieve direct communications among all equipment. With the development of the network, different switches are put into application. According to the OSI or TCP/IP model, the Layer 2 switch works on the data link layer, while the Layer 3 switch works on the network layer. What’s the detailed difference between the Layer 2 and Layer 3 switch? Part I. What Is Layer 2/Layer 3 Ethernet Switch? Layer 2 switch works on the second layer of the data link layer.