If you're doing a long run of cable with the potential for interference (eg from parallel mains electricity, or passing near fluorescent lights, motors or similar) you would be better of using shielded ethernet, that's Cat 6a or Cat 7. For the lengths being used in a residential property the extra cost is negligible.
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Totally unnecessary to use Cat7 cable. Some of my house is still wired with good quality AT&T Cat5 cable and it easily achieves 1G even on long runs with no interference. Just make sure you buy good quality cables.
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