If one has FIOS or some other fiber-optic phone/internet service, what
connects the FIOS box on the wall outside with the FIOS router (or
whatever) next to the computer and the inside phone line?

Is it Cat-5,6? Fiber-optic cable? 4-conductor phone line like has
been used for 80 years (and before that maybe 3-conductor), usually
round and white? If I use Cat-6 will it work better?
--
Micky

https://youtu.be/CDjT1fhrs-A