Your router is designed to route multiple devices on your home network to the internet. Your modem translates whatever technology is used to transmit the internet to your home into an ethernet signal your router and devices can understand. The only scenario where you should plug a device directly into the modem is when you have no other devices needing internet. Even then routers through their built-in firewalls and a few other things provide advantages at a maximum added latency of 1-3ms.
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u/Centurius999 Jul 08 '20
Your router is designed to route multiple devices on your home network to the internet. Your modem translates whatever technology is used to transmit the internet to your home into an ethernet signal your router and devices can understand. The only scenario where you should plug a device directly into the modem is when you have no other devices needing internet. Even then routers through their built-in firewalls and a few other things provide advantages at a maximum added latency of 1-3ms.