OSI defines the process by which a higher layer asks the services from the next lower layer. To provide the services , the lower layer encapsulates the higher layer's data behind the header.
TCP/IP model uses term segments, packets, frames and bits, in above figure.
OSI Model uses more Generic term called Protocol data unit ( PDU ). A PDU represents the bits that include the headers and trailers for that layer, as well as encapsulated data. The following diagram shows the process:
Figure - 1.1 OSI Model PDUs
TCP/IP model uses term segments, packets, frames and bits, in above figure.
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