Someone finally clarified the role of OSI and TCP

I have mentioned the OSI reference model and the TCP reference model before. These two models can be said to be the cornerstones of the Internet. Today we will expand this part of the content.

The four layers of TCP/IP:

Network access layer: The OSI physical layer and data link layer are combined into the network access layer, which defines how to use the network to transmit data.

Network layer: Use the IP protocol to send data packets from the source address to the destination address.

Transport layer: enables applications to communicate with each other.

Application layer: A layer that directly provides services for application processes. Different + types of applications can use different protocols at the application layer according to their needs.

Both OSI and TCP/IP are two very important models. With them, there is the current Internet.

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