Build it: Single Point of Failure
An interactive sandbox where you drag real components together, connect them, and run a live traffic simulation to see where the design breaks.
Challenge: Build a system that handles 60 r/s. Then press <strong>Play</strong> and use the red <strong>X buttons</strong> to kill any single node. If the rest of the system keeps serving (no dropped requests, no overload), you have removed the single points of failure. Hint. Add backups at every layer.