This unit enables learners to understand how data can be transmitted between different client and server technologies in both unsecured and secured states.UDP and TCP based connections are the very heart of the transport layer of the ISO OSI 7-layer model, providing a way for commercial applications to transfer data between a range of client and server-oriented technologies.Although not intended as a networking unit as such, any aspiring software developer should have both an appreciation and technical understanding of the processes required to achieve this type of application connectivity in a commercially oriented programming language.