BBC
Bbc: Gcse Bitesize: Network Types and Topologies
Read all about computer networks. Then take an interactive quiz to test your understanding.
University of South Florida
Florida Center for Instructional Technology: What Is Networking Hardware?
Clickable network map shows information on the types and uses of networking hardware. Very basic introduction.
Other
Tech Soup: Networking 101: Concepts and Definitions
Starts with a simple definition of a network and then explores the components of a network, how a network works, types of networks, communication protocol, and hardware.