![]() This layer works with the application software to provide communications functions as required. ![]() The main purpose of this model is to discuss or describe individual network functions so someone can understand them. The OSI model is not mandated for networking, but because of it's well designed structure, most protocols and systems adhere to this model quite closely. It also adds MAC address information to specify which hardware device the message came from, and which hardware device the message is going to OSI MODEL The Network Interface layer specifies details of how data is physically sent through the network. It also performs the routing of the IP datagrams. The Internet layer packages data into IP datagrams, which contain source and destination address information that is uses to forward the datagram between hosts and across networks. Defines the level of service and status of the connection used when transporting data. The transport layer provides communication session management between host computers. ![]() The application layer defines protocols and how host programs interface with the transport layer services to use the network. In the picture are also some protocols/services that are associated with the corresponding layer. I'll start with the TCP/IP model first, since it was the first one developed out of the two models.The TCP/IP model is much more loose than the OSI model, so there are only four layers and they don't quite correspond to each layer of the OSI Model. In other words, the OSI Model is the conceptual model that is used for communication of telecom or computing systems that disregards the underlying internal structure or technology. The OSI Model is the standard model created by the International Organization for Standardization (ISO) which defines how software and hardware components involved in a network communication should divide the labor and interact with one another. We have two layered models because the TCP/IP Model was first defined by the Department of Defense, where they only had one specific goal of creating a nationwide network.
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