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What are the data units at different layers of the TCP / IP protocol suite?
The data unit formed at the application layer is known as a message, at the transport layer the data unit formed is called either a segment or an user datagram, at the network layer the data unit created is known as the datagram, at the data link layer the datagram is encapsulated in to a frame and finally transferred as signals with the transmission media.
At the Physical layer of the OSI model Repeaters work by regenerating the signal to extend the distance it can travel.
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