Macbook AirPort and Wireless internet

I was on the college campus wireless in the middle of class when my AirPort connection stopped. I got reconnected to the guest network and had full strength, but Safari would say that I wasn't connected to the internet at all.
Since it's the campus wireless, I don't know of anyway to restart a hub or anything.
Does anyone know what could have happened and how I can fix it?

Option click the wireless icon, in upper right menu bar>> open Wireless Diagnostics.

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