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Chapter 1 Introduction 1 1.1 Contributions 3.1 Buffer size for commodity DCN switches and WAN routers. 3.2 DCN / WAN Packet Loss Rate (10 −5 ). 3.3 Parameters and Variables Used in GEMINI. 3.4 Default GEMINI Parameter Settings. 3.5 Impact of RTT Noise on Throughput. 4.1 Buffer size for commodity switching chips. 4.2 Reactive congestion control (RCC) protocols for WAN. 4.3 Data crush of receiver-driven PCC (Figure 4.4). 4.4 Interleaved data arrival of FlashPass (Figure 4.4). 4.5 Traffic characteristic of a production WAN.