upper layer protocols - definizione. Che cos'è upper layer protocols
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Cosa (chi) è upper layer protocols - definizione

LAYER IN THE OSI AND TCP/IP MODELS PROVIDING HOST-TO-HOST COMMUNICATION SERVICES FOR APPLICATIONS
Layer 4; OSI layer 4; Transport protocol; X.214; Host-to-host layer; OSI Layer 4; Transport Layer; Transport-layer; Comparison of transport layer protocols; Comparison of OSI transport protocols; Transport-layer protocol
  • alt=Four labelled stacked blocks. The blue block labelled "transport" is the second from the top.

layer 4         
X.214         
transport layer         
<networking> (Or "host-host layer") The middle layer in the OSI seven layer model. The transport layer determines how to use the network layer to provide a virtual error-free, point to point connection so that host A can send messages to host B and they will arrive un-corrupted and in the correct order. It establishes and dissolves connections between hosts. It is used by the session layer. An example transport layer protocol is {Transmission Control Protocol} (TCP). OSI documents: ITU Rec. X.214 (ISO 8072), ITU Rec. X.224 (ISO 8073). (1997-12-07)

Wikipedia

Transport layer

In computer networking, the transport layer is a conceptual division of methods in the layered architecture of protocols in the network stack in the Internet protocol suite and the OSI model. The protocols of this layer provide end-to-end communication services for applications.: §1.1.3  It provides services such as connection-oriented communication, reliability, flow control, and multiplexing.

The details of implementation and semantics of the transport layer of the Internet protocol suite, 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, while numbered layers are not used in TCP/IP.

The best-known transport protocol of the Internet protocol suite is the Transmission Control Protocol (TCP). 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. Additional transport layer protocols that have been defined and implemented include the Datagram Congestion Control Protocol (DCCP) and the Stream Control Transmission Protocol (SCTP).