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A performance monitoring solution (PMS) is a component of a NMS and includes NetFlow and probe-based monitoring to ensure network optimisation. A performance monitoring solution can provide Deep Packet Inspection techniques to provide root cause analysis of the network being monitoring. 

Most Performance monitoring systems use a combination of both passive (non intrusive) and active (intrusive) tests. Most IT administrators prefer passive testing techniques as it places no load on the network, and measurements are made on the actual network traffic.


Active testing is based on simulation, by generating traffic tests and measuring the results with a network probe. The most simple and recognised active test for performance monitoring is the PING command, which uses the ICMP protocol to test the availablity of the device and network.