client traffic between parent and child domain

what expected traffic (and why generated) between hosts parent child domain (and vice versa)?  i understand these ports hit between domain controllers (https://technet.microsoft.com/en-us/library/dd772723(ws.10).aspx) seeing traffic on ports 389/626/500 between parent domain clients , child dcs.  why clients talking way , expected?

hi,

thanks post.

>why clients talking way , expected?

active directory communication takes place using several ports. these ports required both client computers , domain controllers. example, when client computer tries find domain controller sends dns query on port 53 find name of domain controller in domain.

udp port 389 ldap handle normal queries client computers domain controllers.

tcp port 636  directory, replication, user , computer authentication, group policy, trusts

please check articles more details.

http://blogs.msmvps.com/acefekay/2011/11/01/active-directory-firewall-ports-let-s-try-to-make-this-simple/

https://support.microsoft.com/en-us/kb/832017#4

best regards,

mary dong

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Windows Server  >  Directory Services