PDU in OSI model
PDU in OSI model In telecommunication the term protocol data unit (PDU) has the following meaning. In a OSI layered model, a unit of data which is specified in a protocol of a given layer and which consists of protocol-control information and possibly user data Of that layer. The PDU for each layer of the OSI model is listed below. Physical layer — raw bits (Is or Os) transmitted physically via the hardware Data Link layer — a frame (or series of bits) Network layer — a packet that contains the source and destination address Transport layer — a segment that includes a TCP header and data Session layer — the data passed to the network connection Presentation layer — the data formatted for presentation Application layer — the data received or transmitted by a software application As you can see, the protocol data unit changes between the seven different layers. The resulting information that is transferred from the application layer to the p...