![]() A segment is carried over a datagram, then segments are reassembled into the original application stream. Datagram is mostly a synonym for packet.Īn application data stream can be broken into segments. In the latter case fragmentation and reassembly mechanisms must be devised. ![]() It may fit exactly in one frame or be broken into fragments if required. GFP uses HEC frame delineation, like ATMĪ cell, as in ATM, just to introduce one term more, is a fixed-length frame.Ī packet is instead a protocol data unit that relies on a lower layer unit to determine its boundaries.an Ethernet frame uses preamble and SFD. ![]() an HDLC frame has flags at the beginning and end and a bit stuffing.It is mostly in the data-link layer, which is above the physical.įor a more operational definition, I would say that a frame is a protocol data unit that has means to determine its boundaries. Protocol to fit the MTU size, the resultant unit of data is called Fragments.įrame as physical layer representation doesn't sound 100% accurate to me. I have not seen it to representįragment: My guess here is that when a unit of data is chopped up by a Packet: It is a more generic term used either transport layer or network layer. Hence, we differentiate them as UDP Datagram, IP Datagram. At transport layer, if protocol is UDP, we use datagram If the network protocol is IP, the unit ofĭata is called Datagram. Segment: If the transport protocol is TCP, the unit of data sent from TCP toĭatagram: This is used in 2 layers. Taking from Section 1.2 in TCP/IP Illustrated: Vol 1 by Richard Stevens et al.,Ĭonsider the 4 layered TCP/IP stack: +-+-+
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