Schoolboy question I'm sure, but I'm just after confirmation.
Ten PCs and a NAS drive each with gigabit ethernet cards are connected to a 16-port gigabit ethernet switch with Cat 6 cables.
The gigabit ethernet switch is connected to an ADSL router which supports only 100 mbps. The internet connection is only a 20 mbps ADSL connection anyway.
The router is connected only to the mains; the ADSL phone line; and the switch. No PCs connect directly to it. None of the equipment is using wifi.
In order for the PCs to connect to each other and the NAS drive using gigabit, does the router have to have a gigabit ethernet port (for the connection between it and the gigabit switch) or not?