Here is some useful information to help you when you need to travel in and out of the US when you are traveling to Cornell for the first time, or while you are enrolled at Cornell, or even while you are working after graduation. Feel free to come to the ISSO during walk in advising hours if you have further questions. ISSO advising hours: Monday, Tuesday, Thursday & Friday: 9:00 am-12:00 pm & 1:00-4:30 pm; and Wednesday 1:00-4:30 pm.
The "entry" visa stamp which you apply for at the US consulate in order to get into the US (except for Canadians) is ONLY used for entering the US. Once you are here, you are allowed to stay here even after the entry visa in your passport expires, as long as you are maintaining VALID legal status—meaning you are following the rules for your particular visa status.