TCP operates at Layer 4 which is Transport of the OSI Model!
IP addresses are used primarily by layer 3 (network layer) of the OSI model for routine purposes.
Layer 3 of the OSI model. An ICMP header follows the IP header of the IP packet.
Layer 3 i.e, network layer of the OSI model is used to IP addressing.
DHCP runs at the application layer of the OSI model.
TCP/IP because the osi model has seven layer but in tcp/ip only four layers and most important is that the tcp/ip model is reduce the function of osi model.
transport
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
The TCP/IP model was adopted and condensed into 4 Layers.1. Link layer ( Layer 1and 2 of the OSI model)2. Internet Layer (Layer 3 of the OSI model)3. Transport ( Layer 4, 5 and 6 of the OSI model)4. Application ( Layer 7 of the OSI model)http://en.wikipedia.org/wiki/TCP/IP_model#Link_Layer
The Network Interface layer
IP is a layer 3 (network layer) protocol used for routing
Routers and layer 3 switches work at Layer 3 of OSI model.
Transport layer and Network layer.