Have an intelligent one ready, preferably one that re-emphasizes your cause. You only have 25 minutes to convey what you have to offer on these. Help them out. They will probe for depth on what you do know, and on breadth. If you don't know an answer, say so, and try to add something intelligent on a related topic.
Every interview has a beginning, a middle, and an end.
This is the candidate who wants to be another George C. Marshall. Real interview panel members usually include a range of people willing to take on demanding, 3-day interview task.