--- title: "Production Backend: Scaling, Monitoring & Reliability" lang: "en" author: "Mohammad Abu Mattar" canonical: https://mkabumattar.com/post/production-backend-scaling-quiz --- [Home](/)›[Quizzes](/quizzes)›[All Categories](/quizzes/categories)›[Backend](/quizzes/categories/backend) Quizzes [Prev in BackendNode.js & Express Fundamentals: Building Server Applications](/quizzes/post/nodejs-express-fundamentals-quiz) [Backend](/quizzes/categories/backend)[DevOps](/quizzes/categories/devops) # Production Backend: Scaling, Monitoring & Reliability [Mohammad Abu Mattar](/authors/mohammad-abu-mattar)20 QuestionsIntermediatePublished: 14 Mar 2026 [Markdown for AI(opens in a new tab)](/post/production-backend-scaling-quiz/index.md "Open the plain-Markdown version of this page, for pasting into an AI tool") Series [Backend Programming](/series/backend-programming)4/4 [PreviousNode.js & Express Fundamentals: Building Server Applications](/quizzes/post/nodejs-express-fundamentals-quiz) All posts in this series (4) Quizzes4 1. [Python: Programming Fundamentals & Best Practices](/quizzes/post/python-programming-fundamentals-quiz) 2. [Go: Programming Fundamentals & Concurrency](/quizzes/post/golang-programming-fundamentals-quiz) 3. [Node.js & Express Fundamentals: Building Server Applications](/quizzes/post/nodejs-express-fundamentals-quiz) 4. [Production Backend: Scaling, Monitoring & ReliabilityYou are here](/quizzes/post/production-backend-scaling-quiz) ## Production Backend: Scaling, Monitoring & Reliability Up to 20 questions, shuffled on every run Quiz Configuration Enterto start Welcome to the “Production Backend: Scaling, Monitoring & Reliability” quiz! This quiz tests your knowledge of key concepts and best practices for running production backend systems at scale. You’ll be challenged on topics like scaling patterns, monitoring strategies, error handling, resilience techniques, capacity planning, and incident response. Each question includes detailed explanations to help you learn from any mistakes. Good luck! Answer key and explanations20 questions The quiz above draws 20 questions at random from these 30, so a second attempt will not be the same run. Everything in the pool is listed here. 1. What is horizontal scaling? AnswerAdd more server instances to distribute incoming load 2. What is connection pooling? AnswerMaintain a cache of open database connections for reuse 3. What is a message queue? AnswerBuffer tasks between services for asynchronous processing 4. What is rate limiting in production? AnswerRestrict request volume per user to prevent system abuse 5. What is the circuit breaker pattern? AnswerPrevent calls to a failing service to allow it to recover 6. What is an SLA (Service Level Agreement)? AnswerExternal contract defining uptime goals like 99.9% availability 7. What is an SLO (Service Level Objective)? AnswerInternal performance target used to guide system reliability 8. What is an error budget? AnswerCalculated allowable downtime used to prioritize new changes 9. What is incident response? AnswerStructured process for detecting and resolving service outages 10. What is MTTR (Mean Time To Recover)? AnswerAverage time required to fix a service after an issue starts 11. What is chaos engineering? AnswerInject intentional system failures to test resilience 12. What is graceful degradation? AnswerTurn off non-core features to keep the primary service live 13. What is bulkhead isolation? AnswerPartition system resources to prevent total failure spread 14. What is a canary deployment? AnswerRelease new code to a small group of users before everyone 15. What is structured logging? AnswerUse JSON or key-value pairs to make logs machine-parsable 16. What is log aggregation? AnswerCollect logs from multiple sources into a central search tool 17. What is distributed tracing? AnswerTrack a request as it flows through various microservices 18. What is a liveness vs readiness probe (Kubernetes)? AnswerLiveness ensures the app runs; Readiness ensures it can take traffic 19. What is a load balancer algorithm? AnswerMethod like Round-robin used to distribute traffic to nodes 20. What is a database read replica? AnswerCopy of a database used to handle query traffic and offload primary 21. What is an auto-scaling policy? AnswerSet of rules to add or remove instances based on live metrics 22. What is backpressure handling? AnswerSignal the data source to slow down when the receiver is full 23. What impacts cost in scaling? AnswerUsage of compute, data transfer, storage, and redundant nodes 24. What is blue-green deployment? AnswerMaintain two identical environments and switch traffic between them 25. What is a feature flag? AnswerRemote toggle to enable or disable code without a new deploy 26. What is observability vs monitoring? AnswerMonitoring alerts on symptoms; Observability enables deep debugging 27. What is an alerting strategy? AnswerNotify on actionable symptoms instead of noisy low-level events 28. What is eventual consistency? AnswerDistributed data model where replicas will eventually align 29. What is a cache invalidation strategy? AnswerLogic used to decide when to remove or refresh cached data 30. What is security hardening in production? 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