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Why does layer 4 (the transport layer) of the Open System Interaction divide data into several packets?

From the book Layer 4 - Transport: On networks data is divided into several packets. When you are transferring a big file, this file is sliced into several small packets, and then the computer at the other end gets these packets and put the file back together. Why is this...

Re-transmission concept in TCP

Server sent data to client, but client didn't send ACK for the data . So once RTT completed , Server will resend data to client again .... like that how long it will try to send the data ? What is the maximum time server will try to send the...