On the SAA exam, resilience architecture (Domain 2) accounts for 26%. If the security domain was a verdict problem — "is this request allowed?" — the resilience domain is a radius problem: "how far does this failure spread, and how much can I afford to lose?" The reason test-takers who merely memorize formulas like "Multi-AZ is HA, Multi-Region is DR" get stuck on scenarios is that what the exam asks is not a formula but "onto which isolation level and replication mode do you map the blast radius this workload must survive?" Reviewing resilience properly means mapping keywords to services while seeing how the two variables beneath them — **the failure isolation unit (AZ/Region) and th