I'm adding a secondary router to our Verizon FiOS router in order to isolate certain computers from the rest of the network. My question is: will I need to turn off the computers that are to reside on this secondary network, or can I simply leave them turned on, plugging them into the secondary router (after setting it up) and they'll find the new network without complications? In case it matters, three points: There will be NO wireless connections anywhere All computers are running Windows (various flavors), except for one that's Linux The proposed arrangement is as follows: ONT --> FiOS G-1100 Gateway router FioS router Ethernet LAN port 1 --> network switch --> PCs on 'main' network (unchanged) FioS router Ethernet LAN port 2 --> secondary router --> other network switch --> PCs on 'secondary' network The secondary router (a TP-Link TL-R470T+) would be connected from its WAN port to the second Ethernet port on the FiOS router. The only difference between this new arrangement and the current one is the addition of the secondary router; right now, LAN port 2 on the FiOS router is connected to that other network switch. So, to repeat, the question has to do with whether I need to turn off the PCs that will go on the secondary network and then turn them back on once the secondary router is set up and all the Ethernet cables are hooked up; or whether I can leave the PCs turned on and they'll just find the new network when I move the connection from the FiOS router to the TP-Link router. Thanks a bunch for any help/tips.