1. Repeaters (Operate at the OSI Physical Layer).2. Bridges (Operate at the OSI Data Link Layer).3. Routers {and Brouters} (Operate at the OSI Network Layer).
Router works in Network Layer of OSI model
Routers would be in layer 3 of the OSI model also known as the Network layer.
Routers operate at layer 3. LAN switches operate at layer 2. Ethernet hubs operate at layer 1.
Hubs are a physical layer (layer 1) device; most switches operate at the Data Link layer (Layer 2) of the OSI model.
Hubs and repeaters operate at the Physical Layer of the OSI Model. The Physical Layer is the first layer of the OSI Model.
Layer 3
Repeaters operate at the physical layer of the OSI model.
The NIC operates on Layer 2 (Data Link Layer) of the OSI Model.
Network Layer
network layer
Layer 2 - Data Link