Khan Academy
Khan Academy: Scalable Systems
The Internet began its life as a network connecting universities and research centers. Once it became available and affordable for consumers, it shot up in popularity and is now used by an estimated 4.5 billion people.
Khan Academy
Khan Academy: Bit Rate, Bandwidth, and Latency
Explore how binary information is sent and how quickly they can be sent.
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.