<P> TCP Fast Open is an extension to speed up the opening of successive TCP connections between two endpoints . It works by skipping the three - way handshake using a cryptographic "cookie". It is similar to an earlier proposal called T / TCP, which was not widely adopted due to security issues . As of July 2012, it is an IETF Internet draft . </P> <P> Proposed in May 2013, Proportional Rate Reduction (PRR) is a TCP extension developed by Google engineers . PRR ensures that the TCP window size after recovery is as close to the Slow - start threshold as possible . The algorithm is designed to improve the speed of recovery and is the default congestion control algorithm in Linux 3.2 + kernels . </P> <P> TCP was originally designed for wired networks . Packet loss is considered to be the result of network congestion and the congestion window size is reduced dramatically as a precaution . However, wireless links are known to experience sporadic and usually temporary losses due to fading, shadowing, hand off, interference, and other radio effects, that are not strictly congestion . After the (erroneous) back - off of the congestion window size, due to wireless packet loss, there may be a congestion avoidance phase with a conservative decrease in window size . This causes the radio link to be underutilized . Extensive research on combating these harmful effects has been conducted . Suggested solutions can be categorized as end - to - end solutions, which require modifications at the client or server, link layer solutions, such as Radio Link Protocol (RLP) in cellular networks, or proxy - based solutions which require some changes in the network without modifying end nodes . </P> <P> A number of alternative congestion control algorithms, such as Vegas, Westwood, Veno, and Santa Cruz, have been proposed to help solve the wireless problem . </P>

Which tcp/ip port transmits standard http traffic