DC and DNS Server

Hi all,
I have a pretty simple question. I've been watching the CBT Nuggets for the 293, and in the DNS 1 video, he said that sometimes companies put DNS Servers on DCs. He said they did it when they were using secure, active directory replication to minimize the replication traffic. Has anyone seen this in the real world? Would the DNS Replication traffic bog down the Domain Controller? Thanks!
I have a pretty simple question. I've been watching the CBT Nuggets for the 293, and in the DNS 1 video, he said that sometimes companies put DNS Servers on DCs. He said they did it when they were using secure, active directory replication to minimize the replication traffic. Has anyone seen this in the real world? Would the DNS Replication traffic bog down the Domain Controller? Thanks!
Comments
Pretty much all Windows Domains will use AD intergrated zones, another reality is that most companies large enough to even edge toward the ammount of replication traffick that would cause an issue have enough bandwith to cope with any ammount of replication anyway...users copying power point presentations causes more of an issue for most companies.
But well configured site links and reasonable replication schedules are used anyway in most cases.
Benefits of using AD integrated zones.
* Secure Transfers
* Replication is done through AD replication (which uses compression) rather than zone transfers
* A standard zone can only have 1 primary zones (all of the others must be secondary aka they are read only copies). With AD integrated you can have an infinite number of primary zones.
* I'm sure there are some more benefits, but none are coming to mind at the moment. Feel free to update the list.
Edit: To answer whether the replication bogs down the DC... DC's already do replication. This just adds some more to it and shouldn't be an issue. Even if it was, adding an extra DC or two to add more resources would be worth the costs in order to take advantage of the secure dynamic updates and the multiple primary zones.
It is very common to have ADI Zones and a copy of another Zone as a secondary btw, I prefer this method over conditional forwarders when configuring trusts etc and I have been known to make that zone AD intergrated if I am happy I have all the records I need and that they will not change, but that is not very common at all.