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Networking Hardware

Topic Resource Name Link
Switch Wikipedia Network switch
Router Wikipedia Router (computing)

Online Videos

These online videos expand on or replace the above resources if video is your preferred medium.

Topic Resource Location Link
Hub, Switch, Router YouTube ("PowerCert Animated Videos") Hub, Switch, & Router Explained - What's the difference?
Switch YouTube ("Roger Perkin") What is a Switch in Networking - How does a Network Switch Work?
Router YouTube ("Cisco CCNA Initial Router and Switch Configuration") What Does a Router Do
Ethernet YouTube ("RealPars") What is Ethernet?

Certifications

For certification in networking there is the CompTIA Network+. This isn't a required study but it is a certification that could be useful depending on what you want to do with your career long term.

Another certification path you can take is the very well known Cisco Certified Network Associate or CCNA. This is much more advanced than the Network+, above, but it's also Cisco specific. The Network+ is vendor agnostic.