This depends on your previous experience in the IT field if you had any at all. The questions will be tailored to what they get from your resume. If you don't want to get hung up on something, be sure not to include anything you don't want them to potentially ask about.
To describe an issue that I have overcome in the past technical or not, that taught me something I would later go on to use again.
Refrigeration cycle, Ohms law, Parts of a UPS.
What would you do to improve efficiency?
What is the latest Linux kernel release? How to add a user permissions on a file in Linux command line? Stuff like that. I had maybe 2 relevant hardware questions max.
what is your experience with colo
what did you do on your current job
super detail to equipment component level.
Personality based questions and scenarios. Not very technical.
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