Elements of Transport protocol Transport protocol: The transport layer is a 4 th 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. All transport layer protocols provide multiplexing/demultiplexing service. It also provides other services such as reliable data transfer, bandwidth guarantees, and delay guarantees Elements of transport protocol: Addressing Connection esta...