> Just an FYI...
>
> Every version of Windows since Windows 2000 (sans Windows Me) has had
> the DNS Client service which maintained this caching function. This was
> by design due to the massive dependency on DNS resolution which Active
> Directory has had since its creation. It greatly reduced the amount of
> repetitive lookups required thereby speeding up AD based functions and
> lessening the load on DNS servers. It still exists today up through
> Windows 8. You can disable the service, but it will also break DDNS
> updates unless your DHCP server registers hostnames on behalf of your
> clients.
>
> - -Vinny

DDNS updates (including WINS registrations), static updates, and Active 
Directory registrations are handled by the DHCPClient service since Windows 95 
through all versions of client and server since.  The DNSClient handles caching 
(in a method somewhat akin a very broken caching-only nameserver) only.  You 
can disable the DNSClient service with no ill effect at all (actually, it will 
probably improve things significantly, if you have a local non-Windows caching 
recursive DNS to use).  You cannot disable the DHCPClient service, however, 
without breaking DDNS updates, static configuration, and Active Directory.

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