Networks

Here are some useful videos on Network devices and communication channels.

This video identifies network devices Switches and Routers: https://www.youtube.com/watch?v=EWTJKcg7Pj8

How satellites allow continuous network connections: http://www.space.com/24381-how-non-stop-communication-with-satellites-is-achieved-by-nasa-video.html

The two types of Networks: https://www.youtube.com/watch?v=AWFLGFV4R4c