PDU stands for Protocol Data Unit. It is the technical term for Datagram. PDUs are generated at all levels of the OSI Model, and are distinguished from one another by a prefix that indicates from witch layer or sub layer the PDU originates. For example, an SNMPv1 (Sub-Network Access Protocol Version 1) message consists of a message header and a PDU which contains specific commands and operands tha indicate the object instances involved in the transaction.
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