The interview started with basic questions about the company. After I've got a technical brief about three Debian-based embedded device with the role, IP, installed services, usernames and passwords. This system had different hidden errors and didn't work well together. You must to find and fix that with the instructor's guiding. You should use Google:) It took me about 1,5 hour. I'm not really experienced in Linux, but at the end, the three Linux system worked together well!