You could also run the cable through pipes outside, fit a junction box to the outside wall of your house.
I'd use a switch in room A (they're very cheap and relatively power efficient) and just have one cable from central hub. Allows for better future expansion too. If speed isn't an issue then you could look into using HomePlug adaptors - works fine for my parent's iPlayer on Freesat box. http://en.wikipedia.org/wiki/HomePlug (they can be quite fast in the right circumstances, but I'd definitely opt for cat5e in my bandwidth hungry and latency sensitive household). Cheers, Benjie.
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