TCP/IP MODEL LAYERS
In the seven-layer OSI model of computer networking, the physical layer or layer 1 is the first (lowest) layer. It is a fundamental layer underlying the logical data structures of the higher level functions in a network. The physical layer is usually
Transport layer is the 4th layer of the OSI model, and 3th layer of TCP/IP Model. transport layer provides end-to-end or host-to-host communication services for applications within a layered architecture of network components and protocols.