The Internet is a complex, multi-organisation network reaching nearly all parts of the world. The functioning of the network and the applications running upon it depend on a complex set of protocols. This module addresses the fundamental aspects of the most important issues that permit the network and its applications to operate successfully.

This module is designed to provide an insight into the internal architecture of the Internet, and the functioning of its most critical protocols. The module builds on a basic understanding obtained through study of module CS15210. The module is complementary to module CS25610 which concentrates on application design and construction, whereas this module is concerned with internal behaviour and functionality of the Internet and its protocols. The Internet is an evolving network environment. New applications and supporting protocols are being designed and many of these provide new and different demands from the Internet. The module will conclude by addressing progress towards meeting those demands.