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49871035 49871035 Presentation Transcript

  • TCP
  • The Transmission Control Protocol ( TCP ) is one of the core protocols of the Internet Protocol Suite . TCP is one of the two original components of the suite (the other being Internet Protocol , or IP), so the entire suite is commonly referred to as TCP/IP . Whereas IP handles lower-level transmissions from computer to computer as a message makes its way across the Internet, TCP operates at a higher level, concerned only with the two end systems, for example a Web browser and a Web server. In particular, TCP provides reliable, ordered delivery of a stream of bytes from a program on one computer to another program on another computer. Besides the Web, other common applications of TCP include e-mail and file transfer . Among other management tasks, TCP controls segment size, flow control, and data exchange rate.
  • A TCP segment consists of a segment header and a data section. The TCP header contains 10 mandatory fields, and an optional extension field ( Options , pink background in table). The data section follows the header. Its contents are the payload data carried for the application. The length of the data section is not specified in the TCP segment header. It can be calculated by subtracting the combined length of the TCP header and the encapsulating IP segment header from the total IP segment length (specified in the IP segment header).