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Port Scan vs netstat -- Advantages & Disadvantages?

I need to identify and document the open ports on a Win2k server, but I am a server lightweight. Assuming a server has NOT been compromised, when deciding whether to do a full port scan or just a netstat -a -n, what are the relative merits of each? When & why would their results be different?

Thank you in advance,
parkerea
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Thank you. I had a general idea that was the fact, but the IT folks have been promoting port scans, and for our uses (documenting the server, not its environment such as the firewall) netstat is more appropriate.

Thanks again,
parkerea