I had to do a similar task here. However, my approach had to be focused on security rather than performance or availability.
If you want to do something more generic, you could explain why your machine is performant, secure and scalable.
If you want to do something more security-centric, you could talk about how you deal with security on a daily basis and how security layers are deployed on the machine (firewall, file permissions, defense-in-depth approach, use of secure protocols only, etc.).
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"Any intelligent fool can make things bigger, more complex, and more violent. It takes a touch of genius -- and a lot of courage -- to move in the opposite direction."
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