Various layers of the TCP-IP protocol suite

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 transport layer the data unit made is termed either a segment or a user datagram, at the network layer the data unit made is termed as the datagram, at the data link layer the datagram is encapsulated to a frame and lastly transmitted as signals all along the transmission media.

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