Part 3 - TCP/IP and the OSI Reference Model

At each of these layers there are protocols. The TCP/IP protocols directly relate to layers three and four. TCP/IP stands for Transmission Control Protocol (on the transport layer) / Internet Protocol (on the network layer). There is also a whole family of protocols associated with the TCP/IP stack, which can be found at many of the other layers. Protocols at each of these layers facilitate communication between the layers, smoothly transferring information. Figure 3-1 shows the seven layers of the OSI Reference Model, with common protocols used at each of the layers.


Figure 3-1: Protocols in the OSI Reference Model

This figure taken from searchnetworking.techtarget.com/sDefinition/0,,sid7_gci523729,00.html.


Part 4 - Hubs, Switches and Routers | Back to the Index