I had forgotten about these but Cisco have a great series of 10 minute bite size chunks covering the basics of various network fundamentals. That I thought some people starting out on the CCNA cert might find interesting
If you go to there tech wise TV page, and then under the drop down menu for TechWise TV chose "networking 101"
Cisco - YouTube
Don't expect to learn every thing four your ccna from them, but can be nice if you want a basic introduction to technologies . l
