Domain Name Service is one of the most critical services required in order for the average person to access the Internet. DNS takes the website names we all know and love and turns them into the numeric addresses used by computers.
Troubleshooting DNS requires an understanding of DNS itself, which you can find in our DNS tutorials.
To troubleshoot DNS, you start with the root DNS servers and perform non-recursive queries following the nameserver delegation of sub-domains until you find the authoritative DNS servers. At that point, you query the server for the host information you need. If the answer is correct and no errors are given, you know DNS is working properly.
Two tools exist that assist you in troubleshooting DNS:
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