1 - How do you change settings for a running kernel?
2 - What subnet mask would you use for 30 hosts?
3 - Some scenario about which RAID setup can lose 2 disks.
Some other questions like: Which tools would you use when you have a bad inet connection and you're on call? What would you do if you had both a cron and systemd.timer running the same job? How does DNS work? What tools would you use to troubleshoot enterprise software issues? ETC ETC ETC