Independent preparation · SOA-C03
An operational topic map for selected local practice. Domain labels here are learning groups, not a complete weighted exam blueprint. Verify the official current guide before planning your exam.
Read the explanation, predict a changed scenario, run an experiment and explain the outcome. Return to a topic after a gap. These local exercises supplement study; they do not replace experience using the real services.
The site is slow. You have no metric that says so, no log you can search, and no alarm that fired. Observability is not a service you switch on afterwards; it is a design decision.
ExplorePublic and private subnets are not a setting. A subnet is "public" only because its route table has a path to an internet gateway. Once that clicks, NAT gateways, bastion hosts and VPC endpoints all stop being memorised facts.
ExploreEvery architecture decision is also a decision about what fails together. A single account, a single Region, a single security group, a shared database — each is a boundary, and boundaries are the only thing that limits damage.
ExploreA downstream service slows down. Every caller retries. The retries multiply the load, which slows it further. Retry logic written without thought is the most reliable way to turn a blip into an outage.
ExploreChoose an answer to see explanations for every option. Revisit any question without a timer or login.
Operational diagnosis
Operational diagnosis
Continuity and recovery