Exterior cat6 doesn't need protection, I would have thought, unless it's likely to get snagged / bashed.
I say that as I'm planning to tack some along the bottom of a fence.
It will be:
switch -> patch -> socket -> wiggly under floors -> socket -> patch -> switch -> patch -> socket -> exterior cable wiggly through void and hole in the wall along garden fence through hole in wall -> socket inside outbuilding
[Edited because this
It's hard to terminate exterior grade cable into an RJ45 plug
brings back bad memories]