is it possible to determine whether google talk uses tcp or udp packets for transmission. i know it uses the xmpp protocol at the application layer, but does it run over tcp or udp.
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You can answer this yourself by using a packet sniffer to watch the traffic. This will be much more instructive than having us tell you the answer.
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Greg Hewgill
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You can infer what the answer is: Google Talk works in a browser without requiring a plugin. The only protocol supported through the communication mechanism XMLHttpRequest is TCP/HTTP.
If you are interested in XMPP, have a look here.
...wherein a client utilizing XMPP accesses a server over a [TCP] connection, and servers also communicate with each other over TCP connections.
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jldupont
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That's just the Google Talk web client, not the protocol. – Zarel Nov 18 '09 at 11:47
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... but of course... that was the question, wasn't it? The question can't be about XMPP because one can "google" for an answer, right ;-) – jldupont Nov 18 '09 at 12:51