Transport layer: Difference between revisions

Revision as of 02:10, 24 April 2019

Revision as of 20:00, 10 May 2019

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The details of implementation and semantics of the transport layer of the [[TCP/IP model]],<ref>RFC 1122, Requirements for Internet Hosts – Communication Layers, IETF, R. Braden (Editor), October 1989</ref> which is the foundation of the [[Internet]], and the [[OSI model]] of general networking are different. The protocols in use today in this layer for the Internet all originated in the development of TCP/IP. In the OSI model the transport layer is often referred to as '''Layer 4''', or '''L4''',<ref>{{cite web|url=https://docs.oracle.com/cd/E19455-01/806-0916/6ja85398m/index.html|work=System Administration Guide, Volume 3|title=Introducing the Internet Protocol Suite}}</ref> while numbered layers are not used in TCP/IP.

The best-known transport protocol of TCP/IP is the [[Transmission Control Protocol]] (TCP), and lent its name to the title of the entire suite. It is used for connection-oriented transmissions, whereas the connectionless [[User Datagram Protocol]] (UDP) is used for simpler messaging transmissions. TCP is the more complex protocol, due to its [[stateful design]] incorporating reliable transmission and data stream services. Together, TCP and UDP comprise essentially all traffic on the internet and are the only protocols implemented in every major operating system. Other protocols that are gaining support and usage in this group are the [[Datagram Congestion Control Protocol]] (DCCP) and the [[Stream Control Transmission Protocol]] (SCTP).

{{OSI model}}