Hi, See you must be knowing famous three way handshaking of TCP to start Establishment of connection But, For closing established connection TCP uses four-way handshaking For example A is host B is server listening on particular port. After Established connection if A wants to terminate the conn. Then A send FIN Segment to A telling that he want to tear down the conn. Then B sends ACK of that segment to tell A that you can stop sending DATA but now Data is still flowing from B to A so after sending ACK to A B knows That A wants to terminate the conn. so after sending ACK it again send FIN segment to A telling him that i am closing connection as per u r request again B has to acknlowdge it so it send ACK segment to A to Confirm that conn. is terminated.
you may confuse about why at originating there are 3 way & at closing there is 4 way this is because DATA flow FROM A to B is in control of A while DATA Flow from B to A is in control of B so each one must Separately finish there own data flow. I hope u understood BEST OF LUCK for u r interview. --- Pardeep Sharma <[EMAIL PROTECTED]> wrote: > > Plz tell me in TCP connection way > When we want to close this connection > why we use ACK flag in STEP2 and STEP3 two > times,can anbody expalin me in few words. > According to mine thinking, in step1: HostA send > flag FIN for close the connection and ACK for > pervious data acknowledgment > Step 2: accept the Host Request for close the > connection > Step 3: I think here should only FIN flag is > used,instead of FIN,ACK > > plz tell me soon i m waiting becoz i m going for a > interviw and thanx in advance > > > > --------------------------------- > Here's a new way to find what you're looking for - > Yahoo! Answers > Send FREE SMS to your friend's mobile from Yahoo! > Messenger Version 8. Get it NOW > > --------------------------------- > Here's a new way to find what you're looking for - > Yahoo! Answers > Send FREE SMS to your friend's mobile from Yahoo! > Messenger Version 8. Get it NOW > > [Non-text portions of this message have been > removed] > > Bye , Take Care, Best Regards, Jitendra Chaudhari Jeetu(G2) __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com ***Archives: http://groups.yahoo.com/group/linuxvadapav/messages ***Group Usage Guidelines (Please Read): http://groups.yahoo.com/group/linuxvadapav/files/mailing_rules Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/linuxvadapav/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
