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1 votes
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I know

bits at physical layer

Frame at DLL

Message at application layer

but alwys confuse between Network layer and Transport Layer .

Any better way to learn it ?

2 Answers

Best answer
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Name of PDU (protocol data unit) @ different layer :-

Layer PDU Name
Application Message
Transport Segment(TCP),Datagram(UDP)
Network Datagram(IP)
DLL Frame
Physical stream of bits

Segment: If the transport protocol is TCP, the unit of data sent from TCP to network layer is called Segment.

Datagram: This is used in 2 layers. If the network protocol is IP, the unit of data is called Datagram. At transport layer, if protocol is UDP, we use datagram there as well. Hence, we differentiate them asUDP DatagramIP Datagram.

Frame: Physical layer representation.

Packet: It is a more generic term used either transport layer or network layer.TCP PacketUDP PacketIP Packet etc. I have not seen it to represent Physical layer data units.

Fragment: When a unit of data is chopped up by a protocol to fit the MTU size, the resultant unit of data is called Fragments

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Network layer - packet or datagrams

Transport layer - segments

Physical layer-single protocol data unit (SPDU)

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