Text analysis:
1. Application process data is first transmitted to the application layer, and the header of the application layer becomes the application layer PDU
2. The application layer PDU is then transmitted to the transport layer, plus the header of the transport layer, becomes the transport layer message
3. Transport layer The message is then transmitted to the network layer, and the network layer header is added to become an IP datagram (or packet)
4. The IP datagram is then transmitted to the data link layer, and the link layer header and tail are added to become a data link layer frame
5. The data link layer frame is transmitted to the physical layer, and the bottom physical layer transmits the bit stream to the data medium
. 6. The electrical signal (or optical signal) propagates in the physical medium and is transmitted from the sending end physical layer to the receiving end physical layer
7. The physical layer receives the bit stream and submits it to the data link layer.
8. The data link layer strips off the frame header and end of the frame, takes out the data part, and delivers it to the network layer.
9. The network layer strips off the header and takes out the data part. Submit it to the transport layer
10. The transport layer strips off the header, takes out the data part, and delivers it to the application layer
11. The application layer strips off the header, takes out the data part, and delivers it to the application process
Drawing analysis:
