said by IowaCowboy:I would also go the extra mile and finish the inside outlet with a wall plate. I don't like it when installers cut corners and just pull cabling through the wall/floor and just terminate the end of it.
A direct connection to the cable modem (with no intermediate wall plate splice connection) is only a "cut corner" if it is done against your wishes. The OP has already stated that a simple direct connection is exactly what is wanted in this particular case.