I was very blessed to take a two year Cisco CCNA prep class in highschool. I learned about the seven layers of the OSI model, subnets, routing, dns, and all sorts of practical things. These networking concepts have helped me out significantly when creating distributed microservices in a self service cloud hosted SaaS startup.

Watching my peers have to play catch up, helps me understand how valuable those classes were. I wish I would have paid more attention in them.