TCP/IP model: Difference between revisions

Revision as of 07:22, 27 March 2012

Revision as of 07:23, 27 March 2012

Line 83:

* includes traffic congestion control

The newer [[Stream Control Transmission Protocol]] (SCTP) is also a reliable, connection-oriented transport mechanism. It is [[Messagemessage-stream-oriented]] — not [[byte-stream-oriented]] like TCP — and provides multiple streams multiplexed over a single connection. It also provides [[multi-homed|multi-homing]] support, in which a connection end can be represented by multiple IP addresses (representing multiple physical interfaces), such that if one fails, the connection is not interrupted. It was developed initially for telephony applications (to transport [[Signaling System 7|SS7]] over IP), but can also be used for other applications.

User Datagram Protocol is a connectionless [[datagram]] protocol. Like IP, it is a best effort, "unreliable" protocol. Reliability is addressed through [[error detection]] using a weak checksum algorithm. UDP is typically used for applications such as streaming media (audio, video, [[Voice over IP]] etc.) where on-time arrival is more important than reliability, or for simple query/response applications like [[Domain Name System|DNS]] lookups, where the overhead of setting up a reliable connection is disproportionately large. [[Real-time Transport Protocol]] (RTP) is a datagram protocol that is designed for real-time data such as [[streaming media|streaming audio and video]].