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The ACS version 4.1, can be configured with two differents Active Directorys, to authenticate users ?
Wireless Users ---> WLC --> 802.1X ---> AAA Servers ---> ACS ----> External Data Base ---> Active Directory (server A)
---> Active Directory (server B)
What ACS is linking to is an AD Domain. It's usual to have several domain controllers in the domain, so ACS will automatically get all the domain controller ip address through DNS resolution.