The Transmission Control Protocol provides a communication service at an data structures using c tanenbaum pdf download level between an application p
The Transmission Control Protocol provides a communication service at an data structures using c tanenbaum pdf download level between an application program and the Internet Protocol. An application does not need to know the particular mechanisms for sending data via a link to another host, such as the required packet fragmentation on the transmission medium. At the transport layer, the protocol handles all handshaking and transmission details and presents an abstraction of the network connection to the application. If the data still remains undelivered, the source is notified of this failure.
Once the TCP receiver has reassembled the sequence of octets originally transmitted, it passes them to the receiving application. Thus, TCP abstracts the application’s communication from the underlying networking details. TCP is a reliable stream delivery service which guarantees that all bytes received will be identical with bytes sent and in the correct order. Since packet transfer by many networks is not reliable, a technique known as ‘positive acknowledgement with re-transmission’ is used to guarantee reliability. This fundamental technique requires the receiver to respond with an acknowledgement message as it receives the data. The sender keeps a record of each packet it sends and maintains a timer from when the packet was sent. The sender re-transmits a packet if the timer expires before receiving the message acknowledgement.
The timer is needed in case a packet gets lost or corrupted. While IP handles actual delivery of the data, TCP keeps track of ‘segments’ – the individual units of data transmission that a message is divided into for efficient routing through the network. Transmission Control Protocol accepts data from a data stream, divides it into chunks, and adds a TCP header creating a TCP segment. Processes transmit data by calling on the TCP and passing buffers of data as arguments. 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.
Padded at the end with “0” bytes if necessary. The sequence number of the actual first data byte and the acknowledged number in the corresponding ACK are then this sequence number plus 1. The minimum size header is 5 words and the maximum is 15 words thus giving the minimum size of 20 bytes and maximum of 60 bytes, allowing for up to 40 bytes of options in the header. This field gets its name from the fact that it is also the offset from the start of the TCP segment to the actual data.
For future use and should be set to zero. ECN-Echo has a dual role, depending on the value of the SYN flag. Asks to push the buffered data to the receiving application. Only the first packet sent from each end should have this flag set. Some other flags and fields change meaning based on this flag, and some are only valid for when it is set, and others when it is clear.
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16-bit field is an offset from the sequence number indicating the last urgent data byte. The length of this field is determined by the data offset field. The Option-Kind field indicates the type of option, and is the only field that is not optional. Depending on what kind of option we are dealing with, the next two fields may be set: the Option-Length field indicates the total length of the option, and the Option-Data field contains the value of the option, if applicable. For example, an Option-Kind byte of 0x01 indicates that this is a No-Op option used only for padding, and does not have an Option-Length or Option-Data byte following it. An Option-Kind byte of 0 is the End Of Options option, and is also only one byte. This length is the total length of the given options field, including Option-Kind and Option-Length bytes.
This may be used to align option fields on 32-bit boundaries for better performance. The remaining options are historical, obsolete, experimental, not yet standardized, or unassigned. The TCP header padding is used to ensure that the TCP header ends and data begins on a 32 bit boundary. The padding is composed of zeros. A Simplified TCP State Diagram. TCP protocol operations may be divided into three phases.
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