Transport Protocols
In the IP stack, the transport protocols reside on top of the IP protocol. Applications do not use IP directly, but use the transport protocols to communicate with each other. In the IP protocol stack, there are two transport protocols that are by far the most widely used: the User Datagram Protocol (UDP), and the Transport Control Protocol (TCP). UDP is a best-effort delivery service, which does not add much on top of IP, whereas TCP is a reliable byte stream that adds a connection abstraction on top of the connectionless IP. Although there have been several other transport protocols defined, such as SCTP [229] and DCCP [152], they have as yet to be adopted by the mainstream.
Before we discuss other transport protocols, ...
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