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This article mainly introduces the main use of the transport layer in the network protocol, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, let the editor take you to understand it.

The transport layer in the network protocol is mainly responsible for the data transmission between applications and provides end-to-end services between host application processes. The task of the transport layer is to make the best use of network resources according to the characteristics of the communication subnet, to provide the function of establishing, maintaining and canceling the transmission connection between the session layers of the two end systems, and to be responsible for end-to-end reliable data transmission.

The transport layer is one of the key layers in the whole network architecture, which is mainly responsible for providing services for the communication between processes in the two hosts. Because a host runs multiple processes at the same time, the transport layer has the function of multiplexing and demultiplexing. The transport layer provides transparent data transmission between end users and reliable data transmission services to the upper layer. The transport layer ensures the reliability of data transmission through flow control, segmentation / reorganization and error control on a given link. Some protocols in the transport layer are link-oriented, which means that the transport layer can keep track of segments and retransmit failed segments.

The task of the transport layer is to make the best use of network resources according to the characteristics of the communication subnet, to provide the function of establishing, maintaining and canceling the transmission connection between the session layers of the two end systems, and to be responsible for end-to-end reliable data transmission. At this layer, the protocol data unit for information transmission is called a segment or message.

The network layer only transmits the packets sent by the source node to the destination node according to the network address, while the transport layer is responsible for reliably transmitting the data to the corresponding port. The resource subnet in the computer network is the initiator and receiver of communication, and each device is called an endpoint; the communication subnet provides communication services in the network, and the devices in it are called nodes. The following four layers are used for communication control in the OSI reference model, but their control objects are different.

Importance of the transport layer:

The transport layer is the core of the entire protocol hierarchy and is the only layer responsible for overall data transmission and control. In the OSI seven-layer model, the transport layer is not only the highest layer responsible for data communication, but also the middle layer between the lower three layers for network communication and the higher three layers for information processing. Because the network layer does not necessarily guarantee the reliability of the service, and the user can not directly control the communication subnet, a transport layer is added above the network layer to improve the transmission quality.

The transport layer makes use of the services provided by the network layer and provides the communication port for high-level users to transmit data through the transport layer address, so that the sharing of high-level resources between systems does not have to consider the problems of data communication and unreliable data transmission. Its main functions are to provide reliable transmission services for a conversation or connection, to reuse the connection on a single physical connection to the network, and to provide end-to-end serial number and flow control, error control and recovery services on a single connection.

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