DNS best practice - server placement

[Alan Strassberg]

	What's preferrable - 

	* An internal DNS server with forwarder statements to an upstream (ISP)
	DNS for Internet resolution, or 

	* An internal DNS server forwarding to a DMZ DNS server that does
	the upstream query. 
	
	Other than performance issues, it the internal + DMZ design "better" 
	or is this just adding latency and more points of failure?

	What's the best practice architecture for a large corporation?

					alan