What are these ports?

From: DX (007@sxu.cjb.net)
Date: 10/30/02 

From: "DX" <007@sxu.cjb.net>
Date: Tue, 29 Oct 2002 22:37:28 -0800

When i use "nmap" program do a port scan on my own Linux web server i find
these three entries that i don't recognize:

111/tcp open sunrpc
1024/tcp open kdm
8009/tcp open ajp13

I am running Redhat Linux.

1).Does anyone know what these three ports are? Could you tell me briefly
what they do?

2). Are they enabled by default?

3). Is it safe if i close these ports?

4).How can i close them if i am running Redhat?

Thank you for your helps.

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