Question

What is protocol data unit?

Answer 1

In telecommunications, a protocol data unit is information that is transmitted as a single unit among peer entities of a computer network. A PDU may contain user data or control information and network addressing

Answer 2

In telecommunications, a protocol data unit (PDU) is information that is transmitted as a single unit among peer entities of a computer network. A PDU may contain user data or control information and network addressing. In layered architectures of communication protocol stacks, each layer implements protocols tailored to the specific type or mode of data exchange, or network function of the layer. For example, the Transmission Control Protocol (TCP) implements a connection-oriented transfer mode, and the PDU of this protocol is called a segment, while the User Datagram Protocol (UDP) uses datagrams as protocol data unit for connection-less transfer. A layer lower in the Internet Protocol Suite, at the Internet Layer, the PDU is called a packet, irrespective of its payload type.

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