Switch will work. So might a standard router depending on how many ports you need. You just have to have all the wires terminating in the same place. The wires are dumb, they carry the signal they get. Modem can be anywhere you have the RG6 and Ethernet. Just run the Ethernet to terminate in the same area and you can connect them however you want. Modem > Router > switch > PC/TV/Console. You only need a switch if you want to hard wire more things than the router has ports for.