TCP vs UDP

From: Roberto Ramsis (robertoramsis@hotmail.com)
Date: 11/08/02 

From: "Roberto Ramsis" <robertoramsis@hotmail.com>
To: security-basics@securityfocus.com
Date: Fri, 08 Nov 2002 12:23:27 +0200

hello
thanks to everyone who replied to my last msg
what's the difference between a port TCP and UDP?
i am talking from a firewall concept,i want to know ,if i need to block a
port,when should i block TCP and when UDP and when both?
Thanks in advance

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