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Quiz

2741 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 areas2741 Architecture Fundamentals81 Distributed Systems101 Data Architecture90 Cloud Architecture87 Networking86 API & Integration Architecture78 Reliability & Resilience99 Observability92 Performance & Capacity Engineering90 Security Architecture95 Cost Architecture & FinOps92 Business Architecture93 Architecture Communication91 Enterprise Architecture91 Legacy Modernization92 AI-Era Architecture96 Software Architecture & Engineering84 Architecture Patterns84 Architecture Decision-Making91 The Architect's Meta-Skills92 Delivery & Release Engineering93 Platform Engineering & Developer Experience92 Testing & Quality Architecture102 Data Platform Architecture98 Streaming & Real-Time Data93 Data Governance & Semantics91 Frontend & Experience Architecture91 Edge, Mobile & IoT88 Regulatory & Data Protection Architecture90 Assurance, Audit & Model Risk98
Difficulty Any beginner intermediate advanced

2741 questions.

  1. Strong vs Eventual Consistency advanced

    A booking platform must decide where strong consistency is required. How should the decision be made, and how is it communicated to application developers?

    2 min answer consistencyinvariantsguaranteescommunication
  2. Strong vs Eventual Consistency advanced

    A flash sale puts 500 units of one product in front of 200,000 concurrent shoppers. Design the inventory path.

    2 min answer retailhot-keyinventorycontention
  3. Strong vs Eventual Consistency advanced

    A grocery marketplace shows store availability from a read model fed by change-data-capture streams from each retailer's inventory system. Normal lag is 2 to 4 seconds. During the Saturday peak the stream backs up to 90 seconds and stays there for 20 minutes. Nothing errors and no alert fires. What happens, and which mechanism stops it?

    3 min answer consistencycdcstalenesssubstitutions
  4. Strong vs Eventual Consistency advanced Multiple choice

    A lodging marketplace must show accurate availability across search, listing pages and booking. Which of these need strong consistency?

    2 min answer airbnbconsistencyinventorysearch
  5. Strong vs Eventual Consistency advanced

    Which operations in a ticketing system need strong consistency and which are correct with eventual consistency?

    2 min answer consistencyinvariantsper-operationinventory
  6. Consistency Models advanced

    A crypto exchange must decide which operations require strong consistency and which can be eventually consistent. Where should the line be drawn, and what is the cost of drawing it wrong in each direction?

    2 min answer coindcxconsistencywallettrading
  7. Consistency Models advanced

    A food-delivery platform must match orders to nearby couriers while supply and demand change every few seconds. Which information needs strong consistency, which can be stale, and how should dispatch handle a courier who accepted a job while their availability record was out of date?

    2 min answer swiggydispatchgeospatialstaleness
  8. Consistency Models intermediate Multiple choice

    After a user updates their profile, the page sometimes shows the old value. The team says this is normal eventual consistency. Is that acceptable?

    2 min answer consistencyuxsession-guarantees
  9. Consistency Models advanced Multiple choice

    For a shopping cart at very large scale, would you choose a strongly consistent store or an always-writeable one with conflict resolution?

    2 min answer amazondynamoavailabilitytradeoffs
  10. Consistency Models advanced

    Two people are editing the same page in a collaborative workspace. One loses connectivity for several minutes while continuing to type, then reconnects. What should happen, and what consistency guarantee is actually required?

    2 min answer consistencycollaborationofflinenotion
  11. Constrained Protocols intermediate Multiple choice

    A battery-powered sensor on a cellular network holds an MQTT session. After quiet periods the server's messages stop arriving, though the device's socket is still open and sending works. Which change fixes it at the lowest energy cost?

    2 min answer mqttnatkeepalivebattery
  12. Constrained Protocols beginner Multiple choice

    A metered NB-IoT fleet must not record a reading twice, because readings drive a customer's bill. The team proposes QoS 2 so the broker delivers each publish exactly once. Which choice fits better?

    2 min answer mqttqosidempotencynb-iot