Most people in the networking industry aren't sitting there "designing protocols".. And on the other hand, most people aren't monkeys laying ethernet cable. There are (vendor) engineers in the field who work with customers to design networks for specific applications, and choose the equipment to be installed, and then do the initial setup and troubleshooting. There's also tech support (TAC), who respond to customer situations which require either troubleshooting or some config assistance, and who also replicate issues/bugs in the lab. You could be a software or hardware engineer, or you could be involved with manufacturing/testing or QA.
There's a lot to networking. There's routing (Layer 3), switching (Layer 2), and also load-balancing (Layer 4-7, and we all know how many times AT has had issues with their load-balancer..), so you can pick the field you want to study.
It pays well... 😀