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What kind of network cabling for a behind-siding run?
(reddthat.com)
I'd be mildly worried about the heat/cold cycles damaging the insulation of the non-outdoor rated cable, but it would probably take a long time even in an area that gets extreme temperature swings. If you're moving in the next few years, I'd just stick with standard riser cable. However, if there's any location that is at risk of getting wet or exposed to sunlight (UV), you should definitely stick with outdoor rated cable.