Aim of this paper is to present transmission control protocol of Internet (TCP) and demonstrates some of the problems in modern networks while using TCP. The TCP/IP protocols correspond to the Transport layer and Network layer of the OSI model. The TCP/IP protocol suite defines two standard transport protocols: TCP and UDP. TCP (Transmission Control Protocol) implements a reliable data-stream protocol, whereas UDP (User Datagram Protocol) implements an unreliable data-stream protocol. Both TCP and UDP run on top of the Internet protocol and build the services by IP. IP provides a connectionless datagram service between two computers. By using TCP and UDP data can be delivered not to a remote computer, but to an application process running on the remote computer. These application processes are identified by port numbers. TCP can ensure that data is delivered reliably to the destination by providing a connection-oriented service. UDP is connectionless and cannot guarantee delivery of data.
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