(NGenius performance management system consists of two parts: data source and management software. The data structure of nGenius adopts the standardized RMON format and has high interoperability, because this data source includes the built-in probes of network devices, such as ciscocatalyst switches, as well as dedicated hardware probes. NGenius management software collects data from these data sources, then displays, manages and generates reports, so that network administrators can understand the detailed usage of the network.)