Let's say you are traveling, and you pause in the airport lounge, or your hotel lobby, or a nearby coffee shop. You haul out your laptop and scan the available wireless networks. You know the name of the wireless network because it is written behind the counter/on a slip of paper/well known.
You see that there are two options:
"Free Public Wifi" &
"Free Public Wifi"
Which one is the actual wireless network, and which one is the Evil Twin attack? How can you tell? What tools or techniques would you use to decide?
(I'm less interested in answers that involve not connecting to either, or avoiding public wireless, and more interested in the techniques to discriminate legitimate vs non-legitimate APs from a users and not administrators perspective. I'm using "Evil Twin" in this specific sense rather than a general "malicious actor" sense.)