1. TCP PROTOCOL
M.SANGEETHA
Pondicherry University

2. TCP HEADER
SOURCE ADDRESS DESTINATION ADDRESS
SEQUENCE NUMBER
ACKNOWLEDGEMENT NUMBER
U A P R S F
TCP HLEN R C S S Y I WINDOW SIZE
G K H T N N
CHECKSUM URGENT POINTER
OPTIONS

3. SENDING AND RECEIVING
BUFFERS

4. CLIENT SERVER
SENDING ACK
WAITING EMPTY
FOR ACK
BUFFER
DATA IS FILLED AND
TRANSMITTED
AFTER ACK
BECOMES EMPTY
EMPTY

5. CONNECTION ESTABLISHMENT
AND TERMINATION

6. CLIENT SERVER PASSIVE
ACTIVE
OPEN LISTEN
SYN
SYN SENT SYN RCD
SYN+ACK
SEND ACK ACK ACK RCD
CONNECTION ESTABLISHED
ACTIVE
CLOSE DATA
FINISH FIN
ACK SEND ACK
FIN WAIT1
FIN CLOSE -WAIT
FIN WAIT2
PASSIVE CLOSE
ACK LAST ACK
CONNECTION CLOSED

7. THREE-WAY HANDSHAKE

8. CLIENT SERVER
ACTIVE
DATA TRASFER
CLOSE
FIN
FIN WAIT1 SENDS ALL DATA IN Q & EOF CLOSE -WAIT
FIN+ACK PASSIVE CLOSE
TIME WAIT LAST ACK
ACK
CLOSED CLOSED
CONNECTION CLOSED

9. SIMULTANEOUS OPEN

10. CLIENT SERVER
ACTIVE
OPEN ACTIVE OPEN
SYN SYN
SYN SENT SYN SENT
SYN RCVD SYN+ACK SYN+ACK SYN RCVD
CONNECTION ESTABLISHED

11. SIMULTANEOUS CLOSE

12. CLIENT SERVER
ACTIVE
DATA TRASFER ACTIVE CLOSE
CLOSE
FIN FIN
FIN WAIT1 FIN WAIT1
ACK
CLOSING ACK
CLOSING
TIME WAIT TIME WAIT
TIME OUT TIME OUT
CONNECTION CLOSED

13. DENYING A CONNECTION

14. CLIENT SERVER
ACTIVE
PASSIVE OPEN
OPEN
LISTEN
SYN
SYN SENT SYN RCVD
RST +ACK
CLOSED
CONNECTION
DENIED

15. ABORTING A CONNECTION

16. CLIENT SERVER
CONNECTION ESTABLISHED
ABORT
RST +ACK ERROR
CLOSED CLOSED
CONNECTION
ABORTED

17. THANK YOU