Transport Layer

In computer networking, the transport layer or layer 4 provides end-to-end communication services for applications within a layered architecture of network components and protocols. The transport layer provides convenient services such as connection-oriented data stream support, reliability, flow control, and multiplexing.

Transport layers are contained in both the TCP/IP model (RFC 1122), which is the foundation of the Internet, and the Open Systems Interconnection (OSI) model of general networking. The definitions of the transport layer are slightly different in these two models. This article primarily refers to the TCP/IP model, in which TCP is largely for a convenient application programming interface to internet hosts, as opposed to the OSI-model definition of the transport layer.

The most well-known transport protocol is the Transmission Control Protocol (TCP). It lent its name to the title of the entire Internet Protocol Suite, TCP/IP. 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. Other prominent protocols in this group are the Datagram Congestion Control Protocol (DCCP) and the Stream Control Transmission Protocol (SCTP).

Read more about Transport LayerServices, Analysis, Protocols, Comparison of Transport-layer Protocols, Comparison of OSI Transport Protocols

Other articles related to "layer, transport layer, layers, transport, transport layers":

Telecommunications Systems - Modern Telecommunication - Internet
... At the network layer, things become standardized with the Internet Protocol (IP) being adopted for logical addressing ... At the transport layer, most communication adopts either the Transmission Control Protocol (TCP) or the User Datagram Protocol (UDP) ... if they are lost and placed in order before they are presented to higher layers ...
Transport Layer - Comparison of OSI Transport Protocols
... OSI model defines five classes of connection-mode transport protocols designated class 0 (TP0) to class 4 (TP4) ... error recovery, and was designed for use on network layers that provide error-free connections ... such as the graceful close, which OSI assigns to the session layer ...
Twisted (software) - Core Ideas - Separation of Protocols and Transports
... on stream-based connection semantics, such as HTTP or POP3) and physical transport layers supporting such stream-based semantics (such as files, sockets or SSL libraries) ... Connection between a logical protocol and a transport layer happens at the last possible moment—just before information is passed into the logical protocol instance ... The logical protocol is informed of the transport layer instance, and can use it to send messages back and to check for the peer's identity ...
FCS Network - Transport Layer
... The transport layer is the telecommunications layer ... The transport layer provides ground, aerial, and space communications across the battlefield ... The FCS communications network consists of a three tiered transport layer terrestrial, airborne, and space ...
... Application layer protocols use the underlying transport layer protocols to establish host-to-host connections ... of protocols and methods identified by the name application layer ... In the OSI model, the definition of its application layer is narrower in scope ...

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