[Ilugc] packets and TCP
- From: manokaran@xxxxxxxxx (Manokaran K)
- Date: Thu, 21 Jun 2012 10:43:56 +0530
Syn, ACK and ACK ACK or something.
Let us suppose A and B wants to talk with each other. Then
Assume you and your brother are at home but in different rooms. You know
for sure your brother is at home and is awake and can hear you. In this
case, when you want to pass on a message, (eg. switch off the TV) then you
can shout out the message and get on with your work.
In case you are not sure your brother is at home or is awake, then if you
want to ensure your message reaches your brother you have to ensure he is
capable of receiving the message before you can send it. So, you first call
out his name (SYN), get an acknowledgement (ACK) fro him and then shout out
the message
The first case is connectionless (think UDP) and the second case is
connection oriented (TCP)
IIRC, most implementations of TCP do away with the ACK-ACK part and start
sending the message on receipt of ACK because as you can see from above its
redundant - you dont necessarily have to ACK ACK your brothers ACK by
saying, 'oh, you are there' before you start your transmission :-).
regds,
mano
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