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TCP is a higher layer protocol that provides in-sequence, connection-oriented, reliable delivery of byte stream between internet applications. In-sequence deliver is possible because each byte has a sequence number, connection-oriented-ness means the two TCP entities first exchange a hand shake before exchanging data and reliable means: a. there is the ability to recover from errors, e. g. via retransmission. b. it has in-built security. c. it uses IP for actual transmission. d. it uses reliable routers.

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