DNS Port Usage

From: Abu Hamzah (hamzah.abu@gmail.com)
Date: Wed Dec 06 2006 - 11:54:29 ART

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Hi all

Can someone please clarify how UDP and TCP DNS port 53 is used?

I know that when we try to connect to a website we use UDP DNS port 53.
Also, when a name server is doing Zone transfers it uses TCP port 53 for DNS
Zone transfer. How about, if we connect to a name server1 for resolving say
www.abc.com and this server1 can't resolve the name then does server1 use
TCP port 53 for DNS to and get this from server2?

Any good URL for this background info would be appreciated.

thanks

Abu Hamzah

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