Northrop Grumman interview questions

Was found on LinkedIn and flown out to interview at Lithicum Heights Maryland to interview for a beginner friendly Software Engineer lvl2-3 job. Interview talked about past experiences from jobs, concepts from operating systems course, and difference between an array and linked list. Was also asked the question on what is OO programming. No whiteboard or code writing necessary. No behavioral questions; purely technical high- level questions. Interview was laid back and insightful about the company.