Protocol Data Unit (PDU) Encapsulation, and Encapsulations
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Bits
A Physical Layer PDU used when physically transmitting data over the medium
Frame (Medium Dependent)
Data Link Layer PDU -Transport Header -Network Header -Adds Frame Header -Adds Frame Trailer/Footer
Packet
Network Layer PDU -Transport Header -Adds Network Header
Data
PDU at the application Layer -Bare Data
PDU
Protocol Data Unit -Form that a piece of data takes at any layer
Segment
Transport Layer PDU -Adds transport header