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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

5 questions in Availability Zones.

  1. Availability Zones advanced

    A marketplace runs across three availability zones in one region. What actually happens when one zone fails, and which common design choices turn a survivable zone failure into an outage?

    2 min answer availability-zonesfailure-domainscapacityebay
  2. Availability Zones beginner

    A nightly close job commits 120000 single-row transactions one at a time and finishes in about 2 minutes. After the team enables synchronous multi-zone replication on the managed database the same job takes about 5 minutes with CPU unchanged on both primary and standby. Estimate where the extra time went and say what the same arithmetic implies about synchronous replication across regions.

    3 min answer availability-zonesreplicationlatencycommit
  3. Availability Zones advanced

    One availability zone becomes unavailable. Walk through what happens to a typical three-tier application and what you would have changed.

    2 min answer zonesfailuresingle-points
  4. Availability Zones beginner Multiple choice

    Three copies of a service run in three availability zones behind one load balancer. A regional event takes all three out inside the same minute although no data centre lost power or cooling. Which property of availability zones explains why the physical separation did not help?

    3 min answer availability-zonesblast-radiuscontrol-planestatic-stability
  5. Availability Zones advanced

    What is cell-based architecture, what does it actually buy, and how do you decide cell size and routing?

    3 min answer awscell-basedblast-radiusisolation