This is pretty open ended and dependant on the company you interview for. There are no "public" questions that I've found.
I would be aware of the objective and maybe take a practice test. Find that info here:
http://www.symantec.com/connect/forums/sepm-l1l2-interview
https://www.symantec.com/products-solutions/training/certification/path.jsp?pathID=250-315
http://eval.symantec.com/downloads/edu/250-315%20SEP12.1_Exam%20Objectives.pdf
https://www.symantec.com/products-solutions/training/certification/path.jsp?pathID=sample_exam_250-315
Know these and you'll be in good shape.