The World Academy of Research in Science and Engineering (WARSE)
Overlay directing is an extremely appealing plan that permits enhancing certain properties of the steering, (for example, deferral or throughput) without the need to change the models of the current hidden steering. These offers ascend to the accompanying improvement issue: Find an insignificant arrangement of overlay hubs such that the obliged steering properties are fulfilled. In this paper, the authors thoroughly ponder this improvement issue. This gives rise to the following optimization problem: find a minimal set of overlay nodes such that the required routing properties are satisfied. In this paper, they rigorously study this optimization problem.