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While network simulations for congestion control stud-ieshave often varied traffic loads and protocol parameters,they have typically investigated only a few topologies. Themost common is by far the so-called "barbell" topology.In this paper we argue, first, that the barbell topology isnot representative of the Internet. In particular, we reportthat a measurable fraction of packets pass through multiplecongestion points. Second, we argue that the distinctionbetween the "barbell" topology and more complex topologiesis relevant by presenting a scenario with multiple congestionpoints that exhibits behavior that seems unexpectedbased on intuition derived from the barbell topology (inparticular, a TCP-only system that exhibits behavior technicallyconsidered "congestion collapse"). We make thelarger argument that the typical methodology currently acceptedfor evaluating network protocols is flawed. Finally,we briefly comment on some issues that arise in designinga simulation methodology that will be better suited to comparisonof network protocol performance.