Any in-depth video tutorials on Networking?

I know this is a long shot, but I'm looking for video tutorials that go in-depth about networking.

I have an upcoming school exam, and its centred around the book "Computer Networking A Top-Down Approach". However, I find I am unable to learn well when I read -- I learn much better when I watch / hear concepts being explained.

Are there any video tutorials that teach networking at a deep level? Preferably free, but paid ones are OK as well.