Your son already knew.
When my daughter was 4 I asked her to say all the bad words she knew. She started with the not so bad ones and ended with all the worst ones.
I guess the other kids in her kindergarten had older siblings, so she knew them all already. But most importantly, she also knew when to use them and when not to use them. :)
I'm not op, but: I have 10gbit between by truenas server and my proxmox server. The use case is faster access to files from my proxmox server.
1gbit is actually quite slow when we talk disk speed.