Quiz

2667 questions of the kind that actually get asked — in interviews, in architecture review boards, and by the person who has to run the thing at 3 AM. Every answer states the trade-off rather than the slogan, and says when the obvious choice is the wrong one.

All areas2667 Architecture Fundamentals81 Distributed Systems101 Data Architecture90 Cloud Architecture87 Networking86 API & Integration Architecture78 Reliability & Resilience88 Observability81 Performance & Capacity Engineering90 Security Architecture95 Cost Architecture & FinOps92 Business Architecture93 Architecture Communication91 Enterprise Architecture91 Legacy Modernization92 AI-Era Architecture86 Software Architecture & Engineering84 Architecture Patterns84 Architecture Decision-Making91 The Architect's Meta-Skills92 Delivery & Release Engineering93 Platform Engineering & Developer Experience92 Testing & Quality Architecture90 Data Platform Architecture88 Streaming & Real-Time Data93 Data Governance & Semantics81 Frontend & Experience Architecture91 Edge, Mobile & IoT88 Regulatory & Data Protection Architecture90 Assurance, Audit & Model Risk88

Difficulty Any beginner intermediate advanced

53 questions in Reliability & Resilience.

Quiz

A live-streaming platform defines an SLO of "99.9% of API requests succeed". During a major event, the SLO is met while viewers report the product is unusable. What is wrong with the SLO?

A service exhausts its error budget in week two of a 28-day window. What actually happens next?

Leadership asks for "five nines" across the platform. Engineering says it is impossible. Design the response.

A marketplace's failover mechanism requires calling a control plane to provision replacement capacity. Why is this a design flaw, and what is the alternative?

Your disaster recovery plan provisions capacity in the secondary region at failover time. Why is that a problem?