![]() ![]() It defines how the data should be sent physically through the network.A network layer is the combination of the Physical layer and Data Link layer defined in the OSI reference model.A network layer is the lowest layer of the TCP/IP model.Functions of TCP/IP layers: Network Access Layer Here, hierarchical means that each upper-layer protocol is supported by two or more lower-level protocols. ![]() TCP/IP is a hierarchical protocol made up of interactive modules, and each of them provides specific functionality.The first four layers provide physical standards, network interface, internetworking, and transport functions that correspond to the first four layers of the OSI model and these four layers are represented in TCP/IP model by a single layer called the application layer.The TCP/IP model consists of five layers: the application layer, transport layer, network layer, data link layer and physical layer.The TCP/IP model is not exactly similar to the OSI model.The TCP/IP model was developed prior to the OSI model. ![]()
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