Network performance could be measured using either active or passive techniques.
Active techniques (e.g. Iperf) are more intrusive but are arguably more accurate.
It produces a constant supply of simple Internet statistics.
In most cases the appliance would operate as a bridge on the network so that it is undetectable by users.
Some tools used for SNMP monitoring are Tivoli Netcool/Proviso[4] by IBM, CA Performance Management by CA Technologies.,[5] and SolarWinds[6] Measurement tools generally have these functions and features: