What can the transport layer identify different applications by?

The transport layer can identify different applications through port numbers, because the port number is the service access point of the transport layer, allowing the application process of the application layer to deliver data to the transport layer through the port, which marks the process of the application layer.

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The transport layer can be identified differently by port number Applications.

The port number is the service access point of the transport layer. It allows the application process of the application layer to deliver data to the transport layer through the port. It marks the process of the application layer.

Transport address, that is, the port number is the endpoint of the transport layer communication, and the network address (network service access point) is the endpoint of the network layer communication. Note that each port number is bound to an application process, and the application process passes The respective port number calls the transport layer service. The transport entity (the provider of the transport layer service) calls the network layer service through the local network service access point, that is, the network address, to communicate with the remote peer transport entity.

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