IP operates at layer 3, this is the NETWORK LAYER in the OSI Model.
Network+ Guide to Networks
Fifth Edition
Ch02, pg56, Figure 2-7
TCP and UDP are transport layer protocols; the OSI layer is layer 4 (transport)
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).
IP addresses are used primarily by layer 3 (network layer) of the OSI model for routine purposes.
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 , network layer .
Layer 3 - network addressing.
DHCP runs at the application layer of the OSI model.
Layer 3
Layer 3 of the OSI model. An ICMP header follows the IP header of the IP packet.
3
Repeaters operate at the physical layer of the OSI model.