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CAN is meant to be a single long bus not a star configured link. When you run wiring the idea is to create short taps off the main set of wires. It isn't meant for each thing to necessarily be connected all at the same point. Keep the taps short if you can help it.

CAT6 wiring will likely be fine. What you really need are twisted pairs of wires and you get that with ethernet cabling. Shielding isn't strictly required but would not hurt for CAN. CAT6 is unlikely to be shielded as shielding very fast signals like ethernet can cause reflections and signal issues that you just don't want.
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