After years of working with Windows and its DNS server, I still am confused on some DNS basics. I realize that DNS basically translates computer names to IP addresses buy I don't understand fully understand how each DNS record is updated, or deleted, or what "zones" are.
My immediate question is, what should I be doing to keep up with the DNS records as far as maintenance goes? As I look through the DNS records, there are some very old records listed. I occasionally get problems when I try to VNC a machine I think is still out there, and I end up VNC'ing someone elses machine who has taken over the IP address of the old system. This is really just poor management on my part, but if I see old DNS records in the list, Should I be manually deleting them? Is there a way for the server to purge old records automatically? When computers get re-formated and re-named, or just taken off-line permanently, should I be going to the DNS server and getting rid of these records?
My secondary question would be, does anyone know of a good online tutorial that I could watch/listen too that explains Windows DNS server basics? Specifically, what a network admin should be doing for regular maintenance and hopefully explanations on what the reverse and forward lookup zones mean? There are also a bunch of folders under the DNS server that are titled _sites, _tcp, _udp, _msdcs, etc. I am not sure what those are all about. There are options for "Scavenge Stale Resource Records" and "Set Aging/Scavenging for All Zones..", so maybe this is where I would tell it to purge old DNS records?