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Following table explains about different PDUs at important layers of OSI model. Presentation and session layers are removed, because those layers are not much relevant these days.
|Layer Number||Layer Name||Description|
|Layer 7||Application Layer||Original data generated from network application.|
|Layer 4||Transport Layer||Original data with TCP/UDP headers containing sender’s and receiver’s TCP/UDP port numbers.|
|Layer 3||Network Layer||Data with TCP/UDP headers, with Network Layer header containing sender’s and receiver’s IP addresses.|
|Layer 2||Datalink Layer||Original data with TCP/UDP header, network layer header, and Datalink Layer header containing sender’s and receiver’s MAC addresses. Datalink layer adds a trailer also.|
|Layer 1||Physical Layer||Bits for network transmission.|