On the other hand, these are all pretty superficial and elementary questions. I have never been a Linux admin and I still knew about 2/3 of them, or at least could have fumbled through them (e.g. 3 timestamps).
Debug a possible situation or even something that happened in the past. Take for example these question from ServerFault: "DNAT:ed packets disappearing"* [1] and "Openvpn, forwarding slow since reboot" [2].
*Sorry for the self promotion, but I don't have any better examples right now.
