What are the responsibilities of the transport layer of the TCP/IP protocol?
The transport layer handles the problem of directing information between processes, rather than just between machines.
For example, a single machine may be involved in many network transactions at the same time, including FTP
sessions, telnet sessions, and World Wide Web (HTTP
The transport layer ensures that traffic intended for the FTP service reaches the process responsible for that service, separately from traffic intended for the HTTP and other services.
The two transport-layer protocols in TCP/IP networking are called the
User Datagram Protocol (UDP)
and the Transmission Control Protocol (TCP).