This video is an introduction to the general parts of all networks the come together to form the Internet. Sections include:

• 0:00-2:38 ... Overview of parts
• 2:39-5:20 ... Scale (PAN, LAN, WAN, CAN)  
• 5:21-9:19 ... Topology: Bus, Star, Mesh 
• 9:20-13:25 ... Characterizing a Network: Protocols 
• 13:26-15:40 ... More on Ethernet