Ethernet WiFi Extenders: Bridge Wired and Wireless Devices

It is a device used as an access point: an Ethernet cable supplies the network connection and the device broadcasts WiFi. Confirm that the model explicitly supports access-point mode.

Yes, if the extender has an Ethernet port and supports a wired client connection while extending WiFi. Check whether the port is Fast Ethernet or Gigabit.

Most setups still rely on a router for internet access and network management. An access point extends a wired local network; it does not usually replace the router or modem.

A wired connection can avoid the WiFi link between the extender and a client, but the extender may still use wireless backhaul to reach the router. Actual speed depends on every link in the path.