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DNS Nslookup

Last Modified: 2012-06-21
I have a child domain ex: child.parent.com
from a computer member of that child domain, when I run Nslookup child.parent.com, I get :

adresseses: all ip adresses of my Domain controllers [they don't have ADzone intergarted]

1- why in address it shows all DCs IP addresses?

*some DCs when I ping their ip address with revers lookup : ping -a 10.x.x.x, it replies with gc_msdc.parent.com
2-why it doesn't reply with the computer name of the DC and why it returns the gc_msdc.parent.com instead of gc_msdc.child.parent.com

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