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Is all I need to upgade my LAN to gigabit speed is a gigabit switch, Cat6 and gigabit NIC's? Would my old 10/100 router be a bottle-neck over my LAN? All computers are hooked to the switch, then there's 1 cable to the router. My router handles all internet and DHCP. Will my old PC's be able to handle this?
1 Solution
Your router will NOT be a bottleneck since your internet connection has a far lower speed and your router is sitting on the edge (along with a firewall i hope) of your network. Typicaly your internet connection will be a few MB's. Your switches need to have all ports GB 10/100/1000 along with each computer having 1GB NIC's and yes your cabling should be CAT6 or GB compatible. Your computers should be able to handle this, I don't see why not.  

Hope this helps    
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