Before revision:  For the single bottleneck topology, we empirically analyse some statistical properties of the bottleneck queue. We highlight that in a high bandwidth-delay product and a small buffer regime , and with a large number of long-lived flows, the bottleneck queue may be modelled as an M/M/1/B or an M/D/1/B queue.
After revision:  For the single bottleneck topology, we empirically analyse some statistical properties of the bottleneck queues. These statistical analyses serve to validate an important modelling assumption: that in the regime considered, each bottleneck queue may be modelled as an M/M/1/B or an M/D/1/B queue.