Protocol Data Unit (PDU)
- comprises of the Layer's Header + Upper Layer's Data
- The figure below shows an example of a PDU:
Service Data Unit (SDU)
- a subset of PDU
- comprises of the Upper Layer's PDU
- In the OSI Layer encapsulation, where the OSI Layer goes from N to N-1, the Upper Layer's PDU becomes the SDU in Layer N-1. The figure below shows the example:
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