There is not necessarily a 1-to-1 correspondence between packets and frames. For example, your hardware may have a maximum frame size of 512 bytes, and one protocol youre using might require packets up to 2048 bytes in length. The lower levels of the protocol stack compare the length of the logical packet and the hardware frame size, and break up the packet into multiple frames for transmission if required, then re-assemble the packet fragments found in the frames in the proper order, to re-create the original packet
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