From the e-mail description by Professor Nick McKeown:
Professor Philip Levis and I are teaching one of these free (and often massive) public online classes this Autumn quarter as an "Introduction to Computer Networks". The material is designed to be broadly accessible to anyone who wants to understand the design principles of computer networks, with a special emphasis on how the Internet works. The class is based on our CS144 class for Stanford juniors and seniors, which will run in parallel.The class begins October 8, 2012.