First was a recruiter phone screen with a few questions to determine baseline knowledge. Mostly networking questions.
The more formal interview was ~2.5 hours long. It had a large array of questions about different networking ideas, terminologies, and principles. That was a large bulk of the questions with about 25% being general Linux, VMWare, and windows server questions. Then there is a white board of diagnosing and fixing a few network issues. Overall a large bit of questions but the interviewers were very friendly and I could tell they are looking more for thought process and reasoning than do you know everything under the sun.
Beware they are looking to hire for either a morning 12 hour shift or a night 12 hour shift with weekend coverage as well. They seem to run almost 24/7 and I feel this should be mentioned on the phone screen instead of at the end of the formal interview as I would not have gone that far into the interview. I also feel my offer was low based on qualifications wanted and needed to pass interview process and that seems to be a running trend with other employees on their glass door reviews.