In the OSI reference model, the data unit processed by the network layer is a packet.
The OSI reference model defines implemented functions, data transfer formats, and service access points (SAPs) at each layer.
The network layer is the third layer in the OSI reference model, between the transport layer and the data link layer. It provides two phases in the data link layer. In terms of the transmission function of data frames between adjacent end points, it further manages the data communication in the network and manages to transmit the data from the source end to the destination end through several intermediate nodes, thus providing the most basic end-to-end data transmission service to the transport layer. .
The main contents include: virtual circuit packet switching and datagram packet switching, routing algorithm, congestion control method, X.25 protocol, Integrated Services Data Network (ISDN), Asynchronous Transfer Mode (ATM) and Internet Connecting principles and implementation.
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