Info about UDP and TCP required

[rachitar]

Hi
Can anyone please tell me about UDP and TCP?
Or is there a tutorial available on this board or somewhere.
If possible does someone have a C or C++ code for UDP/TCP that they can provide.
Thanks

[tuXian]

basic diff - TCP is connection oriented and UDP connection less protocol.

what kinda code??

[rachitar]

Originally Posted by TuxiaN

basic diff - TCP is connection oriented and UDP connection protocol.

what kinda code??

Code - C++/C Program for implementation of UDP/TCP interface on 2 machines one as a server and the other as client and both are connected through lan

[digen]

As tuxian has already said TCP is a connection orriented protocol while UDP is a connectionless.
Let me explain this a bit.TCP is virtually what is called a three way handshake.The analogy here is,when you want to make a telephone call you first dial the number[intiatiating the connection] with the appropriate prefix code ,the call takes place[connection],the person at the other end picks up the phone & you say hello.[connection made,send data]
Analogy w.r.t UDP,consider calling someone in a busy market,there is simply no guarantee that the other person will hear you.
The analogies I've given above,you'll find these in a variety of books.
TCP produces much overhead than UDP.UDP is deployed where the delivery of the chunks of data is not guranteed & fast delievery of data is utmost required where as in TCP the data is transfered to the other end & is checked whether the proper data[CRC check] has arrived then it is assembled in a proper sequence.If any part of the data is missing the host at the other end requests for sending of the data again.

So if you are a programmer two things to keep in mind,if data delivery is not important then opt of UDP or else stick with TCP.

[tuXian]

refer some good unix network programming books like Richard Stevens Network Programming.

BTW I will search my computer I think I have got some code like that somewhere in my system its of echoing a server and client and some more progs. Since its late night I will search my computer and tell u tommorrow.

Until then this link might be of help to you its got link to some source code too

http://www.cs.buffalo.edu/~milun/unix.programming.html

http://www-net.cs.umass.edu/ntu_socket/