Break This Infrastructure
Pick a failure and predict what users see before anything is revealed. The wrong answers here are the beliefs that produce real outages, not filler — so each one explains itself. Then the impact hop by hop, the signal that reveals it, the signal that stays reassuringly green, and what limits the damage and what that costs.
Kill a VM Behind the Load Balancer
vmsPredict first
Commit to an answer. The impact stays hidden until you do.
Three application instances sit behind a load balancer in one region. You terminate one of them hard — no drain, no notice, the equivalent of pulling the power cable. What do users see?
Nothing below is shown until you commit — predicting badly and being told why is the whole exercise.