An Introduction to Computer Networks
https://class.stanford.edu/networking/Fall2012/preview/

This is a free Stanford Online introductory course on computer networking, specifically the Internet. It focuses on explaining how the Internet works, ranging from how bits are modulated on wires and in wireless to application-level protocols like BitTorrent and HTTP. It also explains the principles of how to design networks and network protocols. Students gain experience reading and understanding RFCs (Internet protocol specifications) as statements of what a system should do. The course grounds many of the concepts in current practice and recent developments, such as net neutrality and DNS security. Instructors include Nick McKeown, Professor of Electrical Engineering and Computer Science and Philip Levis, Associate Professor of Computer Science and Electrical Engineering, both at Stanford University. Class begins October 8, 2012.