Naming - TCAT checks if devices in two domains have the same SNMP address and are of the same object type but with different names (case sensitive). If so, the reason is “Naming”.
Derived - For the component Classes, if there is no TopoRule matched, TCAT finds out their underlying Device and derives the reason and automated explanations from there.
Only in one domain (IP 8.1.3, IP 9.0, and so on) - TCAT checks both the IP servers to see whether a device is only in one domain. If so, TCAT flags it to be present in only one domain (the matched TopoRules will not be used) and all associated component classes and relationships will be excluded from the report (this occurs during a later stage of report generation). The topo differences are still identified and stored in a certain data structure but not printed in the report.