pageoneresults - 12:59 am on Sep 9, 2004 (gmt 0)

Nameservers on separate class C's

This means that the Nameservers are on different Class C's and are not on the same Class C. If the primary DNS goes down, the secondary DNS will come into play. If both DNS are on the same Class C, this means downtime for the site. If you have NS1 pointing to one DNS and NS2 pointing to another DNS on a different Class C, you have backup.

P.S. I think I described the above correctly. Please, if you see anything wrong with my explanations, don't hesitate to correct me. ;)

Very interesting. I don't "live" in this server config / DNS world and don't even visit it much, but this is educational.

I don't either but I've had to learn so that I can fully understand what the heck is going on with all aspects of the websites that I build and/or maintain. There are so many things that can cause grief for a search engine marketeer from the server level. If you are not aware of those things, there will be major stress in your life. ;)