Protocol data units of the OSI model are:[1]
The Layer 4: transport layer PDU is the segment or the datagram.
The Layer 3: network layer PDU is the packet.
The Layer 2: data link layer PDU is the frame.
The Layer 1: physical layer PDU is the bit or, more generally, symbol.
Internet protocol suite
Protocol data units for the Internet protocol suite are:
The transport layer PDU is the TCP segment for TCP, and the datagram for UDP.
The Internet layer PDU is the packet.
The link layer PDU is the frame.
https://en.wikipedia.org/wiki/Protocol_data_unit
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The Layer 4: transport layer PDU is the segment (for TCP) or the datagram (for UDP).
The Layer 3: network layer PDU is the packet (for TCP/IP).
The Layer 2: data link layer PDU is the frame (for IP).
The Layer 1: physical layer PDU is the bit or, more generally, symbol (for PHY).
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