Lecture TCP-IP protocol suite - Chapter 12: Transmission Control Protocol (TCP)

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Upon completion you will be able to: Be able to name and understand the services offered by TCP, understand TCP’s flow and error control and congestion control, be familiar with the fields in a TCP segment, understand the phases in a connection-oriented connection, understand the TCP transition state diagram, be able to name and understand the timers used in TCP, be familiar with the TCP options.

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Nội dung Text: Lecture TCP-IP protocol suite - Chapter 12: Transmission Control Protocol (TCP)

Chapter 12 Transmission Control Protocol (TCP) McGrawHill ©The McGrawHill Companies, Inc., 2000
CONTENTS • PROCESSTOPROCESS COMMUNICATION • TCP SERVICES • NUMBERING BYTES • FLOW CONTROL • SILLY WINDOW SYNDROME • ERROR CONTROL • TCP TIMERS McGrawHill ©The McGrawHill Companies, Inc., 2000
CONTENTS (continued) • CONGESTION CONTROL • SEGMENT • OPTIONS • CHECKSUM • CONNECTION • STATE TRANSITION DIAGRAM • TCP OERATION • TCP PACKAGE McGrawHill ©The McGrawHill Companies, Inc., 2000
Figure 121 Position of TCP in TCP/IP protocol suite McGrawHill ©The McGrawHill Companies, Inc., 2000
12.1 PROCESS TO PROCESS COMMUNICATION McGrawHill ©The McGrawHill Companies, Inc., 2000
Figure 122 TCP versus IP McGrawHill ©The McGrawHill Companies, Inc., 2000
Figure 123 Port numbers McGrawHill ©The McGrawHill Companies, Inc., 2000
12.2 TCP SERVICES McGrawHill ©The McGrawHill Companies, Inc., 2000
Figure 124 Stream delivery McGrawHill ©The McGrawHill Companies, Inc., 2000
Figure 125 Sending and receiving buffers McGrawHill ©The McGrawHill Companies, Inc., 2000
Figure 126 TCP segments McGrawHill ©The McGrawHill Companies, Inc., 2000
12.3 NUMBERING BYTES McGrawHill ©The McGrawHill Companies, Inc., 2000
The bytes of data being transferred in each connection are numbered by TCP. The numbering starts with a randomly generated number. McGrawHill ©The McGrawHill Companies, Inc., 2000
Example 1 Imagine a TCP connection is transferring a file of 6000 bytes. The first byte is numbered 10010. What are the sequence numbers for each segment if data is sent in five segments with the first four segments carrying 1,000 bytes and the last segment carrying 2,000 bytes? McGrawHill ©The McGrawHill Companies, Inc., 2000
Solution The following shows the sequence number for each segment: Segment 1  10,010 (10,010 to 11,009) Segment 2  11,010 (11,010 to 12,009) Segment 3  12,010 (12,010 to 13,009) Segment 4  13,010 (13,010 to 14,009) Segment 5  14,010 (14,010 to 16,009) McGrawHill ©The McGrawHill Companies, Inc., 2000
The value of the sequence number field in a segment defines the number of the first data byte contained in that segment. McGrawHill ©The McGrawHill Companies, Inc., 2000
The value of the acknowledgment field in a segment defines the number of the next byte a party expects to receives. The acknowledgment number is cumulative. McGrawHill ©The McGrawHill Companies, Inc., 2000
12.4 FLOW CONTROL McGrawHill ©The McGrawHill Companies, Inc., 2000
A sliding window is used to make transmission more efficient as well as to control the flow of data so that the destination does not become overwhelmed with data. TCP’s sliding windows are byte oriented. McGrawHill ©The McGrawHill Companies, Inc., 2000
Figure 127 Sender buffer McGrawHill ©The McGrawHill Companies, Inc., 2000