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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?

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In the message transmission, the message A is a Word document (20M).

Since you used the tag 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.

  • Data link layer

    "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.

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  • Do you mean the message divide into many packets is occur in Layer 4? Sep 29, 2018 at 10:20

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