Scavenger QoS imposes a traffic limit on ports, and if the packets exceeding the limits, it will be marked to lower priority, and might be dropped eventually. If we know an application’s normal behaviour on a device and on the network, a safeguard could be built using Scavenger QoS to recognise and stop the application upon abnormal behaviours. It works in the opposite way of Quality of Service (QoS)#. It reduces Network Congestion and possible DDoS or worm attacks especially if the attacks create a traffic spike (exceeding bandwidth thresholds) for sustained periods.