In this unit, students are provided with the opportunity to gain an understanding of the protocols and technologies of modern computer networks, with particular emphasis on the global Internet. The unit has a "top-down" structure, concentrating firstly, and principally, on network applications and application protocols. The various underlying network technologies are then examined in somewhat less detail. Several "specialist" topics, such as Network and Data Security, Network Management and Network Applications in Electronic Commerce are also covered in overview.