Routers at layer 3, which is network, switches at layer 2 which is the datalink layer, and computers at layer 1 which is a physical layer. If im not mistaken computers are not on the osi layers themselves but the means of sending and receiving data on a carrier, including defining cables, cards and physical aspects are.

Routers at layer 3, which is network, switches at layer 2 which is the datalink layer, and computers at layer 1 which is a physical layer. If im not mistaken computers are not on the osi layers themselves but the means of sending and receiving data on a carrier, including defining cables, cards and physical aspects are.