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The transport layer is a 4th layer from the top.
The main role of the transport layer is to provide the communication services directly to the application processes running on different hosts.
The transport layer provides a logical communication between application processes running on different hosts. Although the application processes on different hosts are not physically connected, application processes use the logical communication provided by the transport layer to send the messages to each other.
The transport layer protocols are implemented in the end systems but not in the network routers.
A computer network provides more than one protocol to the network applications. For example, TCP and UDP are two transport layer protocols that provide a different set of services to the network layer.
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