I have a typical home wireless router with built in 4 port switch. I have two PCs plugged into the router and the router is plugged into a cable modem. All of the cabling used is 100BaseT. I plan on upgrading the router with a 1000BaseT (Gigabit) router to speed up file sharing between the two PCs. The NIC cards on the two PCs already support 1000BaseT. After putting the new Gigabit router in place, will I have to replace the cabling as well in order to get a full 1000 gbps on the local network?