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{{Short description|Communications protocol}}
'''NetFlow''' is a feature that was introduced on [[Cisco]] routers around 1996 that provides the ability to collect IP network traffic as it enters or exits an interface. By analyzing the data provided by NetFlow, a network administrator can determine things such as the source and destination traffic, class of service, and the causes of congestion. A typical flow monitoring setup (using NetFlow) consists of three main components:<ref name="Flow_Monitoring_Tutorial">{{cite journal
| last1 = Hofstede | first1 = Rick
| last2 = Čeleda | first2 = Pavel
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