What is TCP?
TCP was exclusively designed to provide a reliable end to end byte stream over an unpredictable internetwork. all machine supporting TCP has a TCP transport entity either a user process or part of the kernel that manages TCP streams and interface to IP layer. A TCP entity accepts user data streams from local processes breaks them up into parts not exceeding 64KB and sends every part as a separate IP datagram. Client Server method is not necessary for TCP to behave properly.
The IP layer gives no guarantee that datagram will be delivered properly, so it is up to TCP to timeout and retransmit, if needed. Duplicate, lost and out of sequence packets are handled using the sequence number, acknowledgements, retransmission, timers, etc to provide a reliable service. Connection is a must for this service. Bit errors are taken care of by the CRC checksum. One difference from usual sequence numbering is that each byte is given a number instead of each packet. This is done so that at the time of transmission in case of loss, data of many small packets can be combined together to get a larger packet, and hence smaller overhead.
TCP connection is a duplex connection. That means there is no difference between two sides once the connection is established.
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