Common computer network architectures include: 1. OSI architecture, i.e. OSI's seven-layer protocol; 2. TCP/IP architecture, i.e. TCP/IP's four-layer protocol; 3. Five-layer Protocol architecture.
Computer network architecture
The role of each layer
Application layer: The application layer protocol defines the rules for communication and interaction between application processes
Transport layer: The task of the transport layer is to provide general data transmission services for communication between processes in two hosts.
Network layer: Encapsulate the message segments or user datagrams generated by the transport layer into groups or packages for transmission
Data link layer: Assemble the IP datagrams handed over by the network layer into Frames are transmitted over the link between two adjacent nodes
Physical layer: using physical media to transmit data in the form of bits
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