|Internet protocol suite|
T/TCP (Transactional Transmission Control Protocol) is a variant of the Transmission Control Protocol (TCP). It is an experimental TCP extension for efficient transaction-oriented (request/response) service. It was developed to fill the gap between TCP and UDP, by Bob Braden in 1994. Its definition can be found in RFC 1644 (that obsoletes RFC 1379).
This protocol is faster than TCP and delivery reliability is comparable to that of TCP. Unfortunately, T/TCP suffers from several major security problems as described by Charles Hannum in September 1996. It has not gained widespread popularity.
TCP Fast Open is a more recent alternative.
See also 
Further reading 
- Richard Stevens, Gary Wright, "TCP/IP Illustrated: TCP for transactions, HTTP, NNTP, and the UNIX domain protocols" (Volume 3 of TCP/IP Illustrated) // Addison-Wesley, 1996 (ISBN 0-201-63495-3), 2000 (ISBN 9814053090). Part 1 "TCP for Transactions". Chapters 1-12, pages 1–159