What is DNS? How do I test it?

Well I have not configured DNS on Windows Operating Systems for a while, and, today I thought I would look up a tutorial and start practising.  However, I am not sure how to create a DNS which I can 'lookup' through the internal network.  My computers
are connected to a router which obviously has a public IP on the Internet and probably some internal IP assigned through the operating system, however I am not sure how to read it.  
Through the DNS manager I created a primary DNS named theden.net.
Microsoft Windows [Version 6.0.6002]
Copyright (c) 2006 Microsoft Corporation.  All rights reserved.
C:\Users\Administrator>nslookup
Default Server:  ns.melitacable.com
Address:  212.56.128.132
It would seem that the nameserver it uses belongs to the ISP, can I switch to using an internal nameserver for training or doesn't this idea make sense?

Please check this link
http://searchwindowsserver.techtarget.com/tip/DNS-best-practices-Making-AD-rock-solid
Best Regards, Dinesh Patil. MCP-Windows Server 2003 Disclaimer: This posting is provided "AS IS" with no warranties or guarantees , and confers no rights. If you satisfied with answer,please click on Proposed as answer key.

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