Editing Transmission Control Protocol (section)

=== Deprecated proposals ===
[[TCP Cookie Transactions]] (TCPCT) is an extension proposed in December 2009{{sfn|RFC 6013}} to secure servers against denial-of-service attacks. Unlike SYN cookies, TCPCT does not conflict with other TCP extensions such as [[window scaling]]. TCPCT was designed due to necessities of [[DNSSEC]], where servers have to handle large numbers of short-lived TCP connections. In 2016, TCPCT was [[deprecated]] in favor of TCP Fast Open. The status of the original RFC was changed to ''historic''.{{sfn|RFC 7805}}