OSI Seven Floor Model OSI: Open System Interconnection Reference Model
It is proposed by ISO in 1984 to establish a general network standard.
Application layer provides user interface providing user interfaces, for example: Email, WWW, network file access, such as email, network file access, session-related session, inter-control, inter-block, conversion, compression, decompression, decryption, and decrypted transport layer in computer Realizing Reliable / Unreliable Data Transport Realization Flow Control Error Detection To ensure that the corrective network layer of the transfer data (e.g., IP address) path selection data link layer is combined into bytes (BITS) BYTES) Note: 1BYTE = 8BITS Provides a physical address of the computer (MAC address) Error detection Physical layer Defines the mechanical and electrical characteristics of the transmission medium and the electrical characteristic Define the connector (PIN-OUT) electrical characteristics Transmission bitstream (BITS) Data link Layer flow control
TCP / IP four-layer model TCP / IP model originated from ArpaNet Current TCP / IP is a potential standard
The application layer corresponds to the upper three layers of OSI, including a large number of protocols for network users. For example: Telnet, FTP, SMTP, HTTP, SNMP, DNS, etc. The transport layer corresponds to the transport layer of the OSI, providing an end-to-end connection between the source and destination host, and the typical protocol is the TCP network layer corresponding to the network layer of the OSI, effectively solves the interconnection problem of the xenograft network. The design idea of the network layer is simple and simple, providing unreliable connectionless services, trying to deliver. A typical protocol is IP. The network interface layer corresponds to the lower two layers of the OSI reference model, requiring the IP protocol, without detailed definitions.
Comparison of TCP / IP Models and OSI Models
