Protocol Data Unit

In telecommunications, the term protocol data unit (PDU) has the following meanings:

  1. Information that is delivered as a unit among peer entities of a network and that may contain control information, such as address information, or user data.
  2. In a layered system, 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. For example: Bridge PDU or iSCSI PDU

Read more about Protocol Data Unit:  Context in The OSI Model, MAC Protocol Data Unit, Packet-switched Data Networks

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