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32i.Layer Specific Communication |
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32i. Layer Specific Communication
Each layer may add a Header and a Trailer to its Data which consists of the next higher layer's Header, Trailer and Data as it moves through the layers. The Headers contain information that addresses layer to layer communication specifically. For example: The Transport Header (TH) contains information that only the Transport layer sees and all other layers below the Transport layer pass the Transport Header as part of their Data.
PDU - Protocol Data Unit (fancy name for Layer Frame)