this book presents the state of the art results on modeling and analysis of obs networks. it provides researchers with new directions for future research and helps them gain a better understanding of modeling obs networks. this book classifies all the literature on modeling and analysis of obs networks and serves as a thought provoking material for the researchers working on the analysis of high-speed networks. the scope of this book however is not limited to obs networks alone but extends to high-speed communication networks with limited or no buffers.