Technical questions and asking if I'm fine with rotational shift work. Questions on TCP ports such as the port for SMTP etc. Why I'm applying for this job. If I have the requirements for government clearance (this wasn't a requirement for the job but possibly for the future). If I remember correctly, some background about my fondness of the computer security field.

The interview process was very casual and relaxed. It included three interviews with different teams in the company. One interview was technical and another was more a personal fit in the team.