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Today's web services are dominated by TCP flows so short that they terminate a few round trips after handshaking; this handshake is a significant source of latency for such flows. In this paper we describe the design, implementation, and deployment of the TCP Fast Open protocol, a new mechanism that enables data exchange during TCP's initial handshake. In doing so, TCP Fast Open decreases application network latency by one full round-trip time, decreasing the delay experienced by such short TCP transfers.
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Radhakrishnan et al. (2011) studied this question.
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