If you're on the same network, you can instead ssh into the robot with ssh nova@carter.local, where the .local is necessary since its searching the local area network for that computer. That's more reliable if the IP address assigned to the robot later changes if using ssh nvidia@192.168.x.xx

You can also add the index of the robot to your computer so you don't need the .local because you stored info about the robot that can be looked up in search.