Re: TCP three-way handshake

Mohammad,
First the real tree way-shaking is Syn, Ack-Syn, Ack where host A send the
SYN et host B confirm it with a ACK, and B send a SYN et A confim also with
a ACK.
The SYN of the second step and ACK third step is to [1]confirm the
synchronisation from B perspective.

It's like a phone conversation, when Mohammed dial Lessaid's phone, I
pickup the phone whithout knowing who is behind the call until you say :
"Hi it's Mohammed", and I [1]confirm with "Hey ! Hi Mohammed", then we can
discuss knowing eatch other.

--
Lessaid, since '80
 Le 21 mars 2013 07:32, "Mohammad Mousa" <mohd-mousa_at_hotmail.com> a icrit :
> Hello Security guru :o)
>
> I have question regarding how the TCP works? I know that the TCP is a
> connection oriented protocol and is used to make sure that that packet
> received in order and at the same time it's a reliable protocol which means
> if we lost a packet we can detect that based on the TCP sequence number and
> tell the other side to retransmit the packet again.
>
>
> TCP is three way-hand shaking, TCP syn packet and other side will reply
> syn ack and the third phase is the ack. My question is why we need the
> third phase? what the information we have? Actually, I think if I say hello
> and the other side is say hello back is enough, why should I need the third
> step?
>
> Thanks in advance,
>
> Mohammad
>
>
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