What is the responsibilities of the Transport Layer?

Question is:

What is the responsibilities/principles of the Transport Layer?

Solution is:

Transport Layer
The Internet’s transport layer transports application-layer messages between application endpoints.

In the Internet there are two transport protocols, TCP and UDP, either of which can transport application-layer messages.

TCP provides a connection-oriented service to its applications. This service includes guaranteed delivery of application-layer messages to the destination and flow control (that is, sender/receiver speed matching). TCP also breaks long messages into shorter segments and provides a congestion-control mechanism, so that a source throttles its transmission rate when the network is congested.

The UDP protocol provides a connection less service to its applications. This is a no-frills service that provides no reliability, no flow control, and no congestion control. In this book, we’ll refer to a transport-layer packet as a segment.


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