The second aspect of a flow is related to its endpoints. As mentioned the model allows us not only to examine data exchange between two entities on the network, it is as well possible to aggregate all traffic that originates from a specified entity or that is addressed to a specified entity. Such flow specifications are called `` single endpoint flows'' in contrary to the ``double endpoint flows'', where source and destination addresses are being specified.
An example where a single endpoint flow is interesting is the aggregation of all data transferred from a given destination network number. Those measurements could be compared to the traffic aggregated between this network number and a given second network number to calculate the percentile of traffic from the given network to another network.