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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

42 questions in Cost & FinOps.

  1. Cloud Pricing Models intermediate

    A live-streaming platform at Twitch's scale is sizing the bandwidth bill for a new regional tier. Sustained outbound is 40 Gbps with peaks near 120 Gbps. Estimate the monthly cost on cloud list egress against a committed CDN contract, and say which assumption dominates the error.

    3 min answer twitchegresscdnbandwidth
  2. Cloud Pricing Models intermediate Multiple choice

    A media platform's workload is bursty rendering plus steady serving. Which pricing models fit which parts, and what is the common mistake?

    2 min answer pricingcommitmentsspotserverless
  3. Compute Optimisation intermediate Multiple choice

    At 09:10 a checkout service starts returning 503s. Its autoscaler has taken the fleet from 30 to 180 pods in twenty minutes, CPU per pod sits at 22%, and the database reports connection waits. That day's compute bill is four times normal and traffic is up only 30%. Which explanation fits every symptom?

    3 min answer autoscalingconnection poolingfeedback loopcost spike
  4. Cost Allocation intermediate

    Forty percent of your cloud spend is untagged. What do you do?

    2 min answer taggingallocationgovernanceenforcement
  5. Cost & FinOps intermediate

    A platform's cloud spend grows faster than traffic for six quarters, with no single team responsible. Why do cost-reduction sprints fail to hold, and what is the reframing that works?

    2 min answer finopsunit-economicsattributiongovernance
  6. Cost & FinOps intermediate

    Finance wants to cut cloud spend by committing to one-year and three-year reservations. What do you commit to, and what could go wrong?

    2 min answer finopscommitmentsreservationscost
  7. Cost & FinOps intermediate

    The cloud bill has tripled in six months while traffic grew 40%. How do you find out why, and what do you expect to find?

    2 min answer finopscostdiagnosisegress
  8. Cost Governance intermediate

    A team adopts an elastic analytical platform and receives a surprising invoice. What controls should have existed, and why do they get added late?

    2 min answer snowflakeelasticitygovernancequotas
  9. Cost Governance intermediate

    The cloud bill has doubled year on year while revenue grew 20%. The CFO wants a plan. What is your approach?

    1 min answer finopscostgovernancecloud
  10. Architecture Cost Modelling intermediate

    An architecture review must estimate the cost of a proposed design before it is built. What should the model contain, and what makes such estimates useless?

    2 min answer cost-modellingarchitecture-reviewestimationdrivers
  11. Architecture Cost Modelling intermediate

    The cloud bill doubled over three months with no traffic growth. Where do you look?

    2 min answer finopsdiagnosiscost
  12. Cost per Request intermediate

    A communications platform of the kind Twilio operates bills its customers per message. Most of what it pays per message goes to carriers rather than to its own servers. The team commits to halving infrastructure cost per message this year. What does that buy, and what does it give up?

    3 min answer unit economicscost of goods soldroutingmargin