![]() IP simply handles the routing of datagrams and if problems occur, IP discards the packet without a second thought, generating an error message back to the sender in the process. The IP layer delivers the datagram hop by hop and does not guarantee delivery of a datagram it is a connectionless system. In fact all the layers below TCP are unreliable and deliver the datagram hop by hop. Why use a transport layer which is as complex as TCP The most important reason depends on IPs unreliability. What is TCP In theory, a transport layer protocol could be a very simple software routine, but the TCP protocol cannot be called simple. Before writing this section, the information has been studied from varied sources like TCP guide, RFCs, tanenbaum book and the class notes. Udp Checksum C Program' title='Udp Checksum C Program' />This section will end with a comparison between UDP and TCP followed by a nice exercise which would encourage readers to solve more and more problems. This section will help the reader to get to know about the concepts and characteristics of the TCP, and then gradually dive into the details of TCP like connection establishmentclosing, communication in TCP and why the TCP protocol is called a reliable as well as an adaptive protocol. Connection Oriented vs ConnectionlesseditAfter going through the various layers of the Model, its time to have a look at the TCP protocol and to study its functionality. TCP is connection oriented protocol and UDP is connectionless protocol. In the OSI model, TCP and UDP are Transport Layer Protocols. The differences are very essential to be known because of vast use of tcp and udp services which is sometimes confusing. This page will talk about what TCP and UDP are, and what the differences are between them. TCP and UDPeditThe TCP and UDP protocols are two different protocols that handle data communications between terminals in an IP network the Internet. Communication NetworksTCP and UDP Protocols. ![]()
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