Osi (open system interconnect), that is, open system interconnection. Generally called the osi reference model, it is a network interconnection model studied by the iso organization in 1985. This architecture standard defines a seven-layer framework for network interconnection (physical layer, data link. The data transmission units of each layer of computer OSI are as follows: Physical layer: The unit is bit. At the physical layer, data is not organized yet and is processed only as a raw bit stream or electrical voltage. Data link layer: The transmission unit is the frame. data link. Arp belongs to the data link layer. According to the OSI reference model, when the data link layer encapsulates an IP message, it needs to obtain the link layer destination address through arp and add it to the header of the message. This is not a function of the network layer. Conclusion: In tcp/ip mode.
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The Osi/rm reference model has 3 main concepts: service, interface and protocol, but the tcp/ip reference model initially did not clearly distinguish between services, interfaces and protocols. 1. Protocol: Network protocol is the rules that both parties in communication must abide by.
