This module presents network services that transport the traffic between consumers, businesses, suppliers, government agencies, and various other players in an Internet environment. This is one module of an extensive handbook that systematically discusses how to translate e-business strategies to working solutions by using the latest distributed computing technologies. Chapters of this module discuss the following topics: a) physical network concepts, categories, and technologies, b) network architectures and interconnectivity devices that combine the physical networks into a large global network (the Internet), c) telecom business that includes bandwidth trading and network integration, among others, d) wireless and broadband networks that are being merged to form the Next Generation Networks, e) discussion of IP in detail and evolution of the current Internet into Next Generation Internet, and f) industrial use (state of the practice), commercial product development (state of the market), and research activity (state of the art) in networks. Chapters of the module also include several real life examples and case studies to highlight practical applications. Additional information and instructor material available from author website (www.amjadumar.com).