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As you can see from the picture above, the TCP/IP model has fewer layers than the OSI model. The Application, Presentation, and Session layers of the OSI model are merged into a single layer in the TCP/IP model. Also, Physical and Data Link layers are called Network Access layer in the TCP/IP model. Here is a brief description of each layer: The TCP/IP Protocol Suite. The TCP/IP protocol suite consists of many protocols that operate at one of 4 layers. The protocol suite is named after two of the most common protocols - TCP (transmission Control Protocol) and IP (internet Protocol). TCP/IP was designed to be independent of networking Hardware and should run across any connection Layer 1.Then the information transmitted over the channel to the next station's Layer 1 and transmitted to succeeding layers till information delivered to Layer 7. Each Layer in the OSI model does the job for the previous layer and also adds prefixes information termed as "header". The data Chapter 4: OSI Model and Network Protocols 4.1 Explain the function of each layer of the OSI model Layer 1 - physical . Layer 2 - data link . Layer 3 - network . Layer 4 - transport . Layer 5 - session . Layer 6 - presentation . Layer 7 - application What You Need To Know Identify the seven layers of the OSI model. .