Take the 2-minute tour ×  According to what I've read, there are
three main connection types in computer networks:    •
Unacknowledged, connectionless (e.g. UDP)   • Acknowledged,
connectionless (e.g. ?)   • Acknowledged, connection-oriented
(e.g. TCP) share|improve this question add comment  4 Answers
up vote 4 down vote accepted  From memory those three connection
types are defined by the OSI network model, and while the TCP/IP
and OSI Models may share some similarities the support of
certain features required/implied by OSI does not necessarily
translate into support in the TCP/IP model.  Everything I can
find regarding "acknowledged, connectionless" protocols simply
refers to it being a feature/requirement in the Data Link Layer
of the OSI model  While the OSI model is a good model for
learning how a network should work, is not necessarily perfect
for widespread usage and some of the features are simply not
worth the effort to implement in common networking protocols.
The two types you listed (TCP and U