192.168.10.37/26. Network, mask, broadcast, first host, last host, usable count. No calculator, no cheat sheet. If you rattled all six off without breaking stride, you got your reps in somewhere.
Every network engineer has that moment. You’re troubleshooting something, you reach for the tool that should exist, and it either doesn’t or it was last updated when Obama was in office.
Following the current popular topic of “Whats in your toolbag?” ala Stretch and Fryguy. I’ve decided (after some persuading) to detail the contents of my own bag.