A Protocol Data Unit (PDU) is a unit of data specified in a protocol of a given layer of the OSI model. Each layer has its own PDU: at the Application layer, it's called a message; at the Transport layer, it's a segment (or datagram in UDP); at the Network layer, it's a packet; at the Data Link layer, it's a frame; and at the Physical layer, it's a bit or symbol. These PDUs help in managing and encapsulating data as it traverses through the layers of the OSI model.
Ethernet is a data link layer protocol - layer 2
PDU (protocol data units) -Yuriy-
Protocol Data Unit (PDU)
TCP protocol insures that your data was delivered in reliable and rapid way.
PACKETS
frame
Data link layer of the OSI model..
A PDU (Protocol Data Unit) is defined by which layer it is in. In the physical layer and network layer, it is synonymous with the packet, in the data link layer, it is the frame. In the transport layer, it is a datagram for UDP. A datagram holds one or more PDU's, as it is the basic unit of transferring information via packet switching.
Packets
ICMP (Internet Control Message Protocol)
transport protocol control the transportation of data and choose the best way for transmit ion.
internet