Giving it a bit of modern relevance, how about a science kit with a couple of firewalls, routers, switches, maybe a wireless router, a traffic generator, some patch cables, and instructions on how to set things up so they get an idea of how the internet really works. Practice network hacking, see how a dos attack really works, man-in-the-middle attacks, understand how encryption/ssl works, add in your own laptops or other devices and make them work securely between each other, or see how you can compromise the security. ‘ISP in a Box’
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