Ethernet Router/Gateway
A Router or Gateway is used to translate one protocol to another.
It is also used when the physical layer changes mediums.
Ethernet to fiber
At one time there was a difference between a router and a gateway.
The gateway was strictly used as a medium translator ( electrical ) and the router was strictly used as protocol translator ( software ).
Now routers and gateways are normally combined and called a routers.
Note: Ethernet to WiFi is a router functionality.
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