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Quiz

2988 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 areas2988 Architecture Fundamentals91 Distributed Systems111 Data Architecture100 Cloud Architecture97 Networking96 API & Integration Architecture97 Reliability & Resilience99 Observability92 Performance & Capacity Engineering100 Security Architecture105 Cost Architecture & FinOps102 Business Architecture103 Architecture Communication102 Enterprise Architecture100 Legacy Modernization102 AI-Era Architecture106 Software Architecture & Engineering93 Architecture Patterns94 Architecture Decision-Making101 The Architect's Meta-Skills102 Delivery & Release Engineering103 Platform Engineering & Developer Experience102 Testing & Quality Architecture102 Data Platform Architecture98 Streaming & Real-Time Data103 Data Governance & Semantics91 Frontend & Experience Architecture101 Edge, Mobile & IoT98 Regulatory & Data Protection Architecture99 Assurance, Audit & Model Risk98
Difficulty Any beginner intermediate advanced

4 questions in Latency.

  1. Latency advanced

    A collaborative editor must feel instantaneous to users on different continents, where physics imposes a floor of roughly 150 ms round trip. How is the latency requirement met at all?

    2 min answer latencylocal-firstoptimistic-uiperception
  2. Latency advanced

    A load generator reports a p99 of 30 ms at 5,000 rps. In production at the same rate, users report multi-second stalls, and the service's own latency metrics agree with the load test. Both measurements are honest. What is being missed?

    3 min answer coordinated omissionload testingpercentilesqueueing
  3. Latency beginner

    A mobile screen issues eight backend calls one after another because each needs the previous result. Server time is 25 ms per call and the network round trip is 40 ms. Why does the screen take over half a second, and why does making the servers twice as fast barely help?

    2 min answer latencyround-tripswaterfallmobile
  4. Latency advanced

    A page makes 20 parallel backend calls, each with a p99 of 1 second and a p50 of 40 ms. What is the page's latency profile?

    2 min answer latencytailfanoutpercentiles