There's a small network that's in 1 building that we want to extend to another building about 75 feet away but running an Ethernet cable is not easily doable. I'd like to extend the network wirelessly but I don't recall ever going from a wired, to a wireless, then back to a wired network as in the image. I need to know what Black box A and Black box B would be if this is even possible. Is there such a thing?
Thanks,
Sure, you can do this. In fact, it's fairly common. There's nothing magical about wireless as a physical network layer.
Normally, it's done with more expensive dedicated wireless networking gear. I don't think consumer wireless router/gateway devices generally have this as an advertised feature, but if you can replace the firmware, you can do this with either DD-WRT or OpenWRT:
Yes, you are looking for wireless bridging. There are many devices that can do this.
