Data units at various layers of TCP-IP

Describe the data units at various layers of the TCP/IP protocol suite?

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The data unit made at the application layer is termed as a message; at the transport layer, the data unit created is termed either a segment or a user datagram. At network layer, the data unit made is termed as the datagram, at data link layer the datagram is encapsulated into a frame and lastly transmitted as signals all along the transmission media. 

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