Computer Networks on Coursera
Can’t recommend this course highly enough if you’re a web dev of are doing work beyond one device.
It’s a very bittersweet course, as I continuously run into concepts that make me go:“I really should already know this like the back of my hand”, but oh well, it’s never too late.
David Wetherall is a very pleasant instructor and does a superb job.
I have to say I have a much better understanding of networking internals now and this is a good ramp for diving into meatier material such as http://www.amazon.com/TCP-Illustrated-Volume-Addison-Wesley-Professional/dp/0321336313