Re: 2 PC, 1 USB and Ethernet
If you use a router to share the internet connection:
The modem connects to the router.
The router is then connected to the two PCs.
The router shares the internet access with both PCs.
If one PC is turned off the other will still have access because it is still connected to the modem through the router.
If you use the PC downstairs to share the internet connection:
The modem is connected to the downstairs PC.
The downstairs PC sends signal to the upstairs PC.
If the downstairs PC has no power (it's turned off) the upstairs PC won't get any signal and therefore can't access the internet.
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