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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

92 questions in Legacy Modernization.

  1. Rehosting intermediate Multiple choice

    A nightly billing batch that ran in 4 hours 10 minutes on a 2016 on-premises server takes 9 hours 20 minutes after a lift-and-shift onto a cloud instance with twice the vCPUs and four times the memory. CPU sits near 12 percent across all cores and the instance is never network-throttled. Where is the time going?

    3 min answer rehostlift-and-shiftbatch-windowsingle-thread
  2. Rehosting intermediate

    An organisation rehosts its estate to cloud infrastructure and finds costs higher and reliability no better. What did rehosting not deliver, and what should follow?

    2 min answer rehostlift-and-shiftcostcloud
  3. Rehosting intermediate

    When is lift-and-shift the right migration strategy, and what must be planned alongside it?

    2 min answer rehostmigrationcostreplatform
  4. Replatforming intermediate

    A marketplace replatforms a service from a self-managed database to a managed one. What benefits are real, what constraints appear, and what must be verified first?

    2 min answer replatformmanaged-servicesconstraintsmigration
  5. Replatforming intermediate

    A team replatforms a self-managed database onto a managed service in six weeks and the project lands on time. Eighteen months later they are running an unplanned major-version upgrade over a weekend because the provider's standard support for their engine version ends. What did the replatform actually trade away, and when does that bill arrive?

    3 min answer replatformmanaged servicesupgradesend of support
  6. Replatforming advanced

    You have twelve weeks and a large estate. Which replatforming changes do you make and why those?

    2 min answer replatformmanaged-servicesprioritisationoperational-burden
  7. The Six Rs intermediate

    A company must modernise a portfolio of applications. How should each be assigned a modernisation approach, and what is the most common misassignment?

    2 min answer udaansix-rsportfoliorehost
  8. The Six Rs beginner Multiple choice

    A data-centre lease ends in seven months and 900 virtual machines on an on-premises hypervisor cluster have to leave. The portfolio review assigned every one of them "rehost" — rebuild each machine on native cloud instances. The team moves about 25 machines a week. Which disposition fits the constraint?

    3 min answer six-rsrelocaterehostdata-centre-exit
  9. The Six Rs intermediate

    A travel platform must move a portfolio of applications off ageing infrastructure. How should each application be assigned among rehost, replatform, refactor, rebuild, replace and retire?

    2 min answer six-rsportfoliomigration-strategyexpedia
  10. The Six Rs intermediate Multiple choice

    Of the six migration strategies, which is most often skipped and why does that matter?

    1 min answer six-rsretireportfoliorationalisation
  11. Strangler Fig advanced

    A commerce platform begins a strangler migration. Which slice should be first, and what must exist before any slice moves?

    2 min answer strangler-figsequencingfacadeanti-corruption-layer
  12. Strangler Fig beginner

    A facade in front of a 12-year-old monolith routes 3 of about 20 capabilities to new services, matched by URL prefix. A new mobile build starts calling an endpoint nobody listed in the facade's configuration. What happens, and what should the facade's behaviour for an unmatched route be?

    3 min answer strangler-applicationfacaderoutingdefault-route