This image shows two Endeca MDEX distribution groups residing in different fault domains. It is made up of three functional tiers:

• Tier 1: Contains a box labeled Oracle Commerce that contains the text Endeca EAC/XM.
• Tier 2: Contains two boxes, one labeled fault domain 1 and the other labeled fault domain 2. Fault domain 1 contains Endeca MDEX distribution group 1, version 1. Fault domain 2 contains Endeca MDEX distribution group 2, version 1.
• Tier 3: Contains a box labeled Oracle Commerce that contains the text ATG. User requests originating from ATG are connected separately to each of the fault domains in tier 2.