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In the message transmission, the message A is a Word document(20M).
When A transfer, it will be divide to many packets, every package added a header for marking as source address and destination address.
In the accept end, it will cut off the packet header, and group them as a whole Word document(20M).
in there, can we call the received data as message?
In the message transmission, the message A is a Word document (20M).
Since you used the tag switch you are referring to layer 2. In layer 2 the frame is the "message".
When A transfer, it will be divide to many packets, every package added a header for marking as source address and destination address.
Not at layer 2.
"The data link layer is concerned with local delivery of frames between nodes on the same level of the network. Data-link frames, as these protocol data units are called, do not cross the boundaries of a local network. Inter-network routing and global addressing are higher-layer functions, allowing data-link protocols to focus on local delivery, addressing, and media arbitration. This way, the data link layer is analogous to a neighborhood traffic cop; it endeavors to arbitrate between parties contending for access to a medium, without concern for their ultimate destination.".
In the accept end, it will cut off the packet header, and group them as a whole Word document (20M). In there, can we call the received data as message?
A 20 megabyte file would use layer 4 to assemble the segments into a message.
