Question : New Domain DNS Delegation

Gang, I’ve just installed a new domain tree DC in my forest. There was a message at some point stating that there needed to be a DNS delegation; however, I didn’t log the message. Now that I have the new domain DNS, what need to be delegated? DNS on the parent/root domain to the new domain or?  

In addition Im getting this error in the logs which might be related:
Log Name:      DNS Server
Source:        Microsoft-Windows-DNS-Server-Service
Date:          7/6/2010 4:41:15 PM
Event ID:      4515
Task Category: None
Level:         Warning
Keywords:      Classic
User:          N/A
Computer:      sd-ktosdc01.kratos.us
Description:
The zone kratos.us was previously loaded from the directory partition DomainDnsZones.kratos.us but another copy of the zone has been found in directory partition ForestDnsZones.wfinet.com. The DNS Server will ignore this new copy of the zone. Please resolve this conflict as soon as possible.
 
If an administrator has moved this zone from one directory partition to another this may be a harmless transient condition. In this case, no action is necessary. The deletion of the original copy of the zone should soon replicate to this server.
 
If there are two copies of this zone in two different directory partitions but this is not a transient caused by a zone move operation then one of these copies should be deleted as soon as possible to resolve this conflict.
 
To change the replication scope of an application directory partition containing DNS zones and for more details on storing DNS zones in the application directory partitions, please see Help and Support.

Answer : New Domain DNS Delegation

A delegation is just a hint, that another DNS server is responsible to resolve a name.

If you have .kratos.us as Forest DNS zone, and several subdomains i.e. sub.kratos.us, then you can add a delegation on the DNS Server for .kratos.us within this zone for "Sub" which points to another DNS Server. This tells the requester, that the DNS Server in the domain sub.kratos.us is responsible for this (sub)domain.

If you do not have subdomains, there is not need for any delegations / DomainDNS Zones and ForestDNS zones are the same.
The last two settings are set by windows, if you install a dc into a forest. If all DNS are Active Directory integrated, there is usuall ynot need to add setting manually.