System Design Interview Prep Quiz Welcome to your System Design Interview Prep Quiz 1. System Design How should APIs expose breaking changes? Choose the best architectural decision.Deselect Answer Modify existing response Change silently New API version Remove fields None 2. System Design Which design minimizes blast radius during failures? Choose the best architectural decision.Deselect Answer Single JVM Service isolation Global lock Shared database for all None 3. System Design Which metric best measures service reliability? Choose the best architectural decision.Deselect Answer Heap size Class count Disk capacity Error rate and availability None 4. System Design Need fast autocomplete suggestions. Best data structure? Choose the best architectural decision.Deselect Answer Heap Trie Queue Stack None 5. System Design For search ranking, which component is typically separate from OLTP DB? Choose the best architectural decision.Deselect Answer API Gateway Search Index CDN Load Balancer None 6. System Design How should feature rollout be controlled? Choose the best architectural decision.Deselect Answer Branch per user Separate DB Restart services Feature Flags None 7. System Design How should synchronous service calls be protected? Choose the best architectural decision.Deselect Answer Infinite retries No timeout Restart service Timeouts + Retries + Circuit Breaker None 8. System Design A video streaming platform must reduce buffering worldwide. Best architecture? Choose the best architectural decision.Deselect Answer Single data center Shared folder Bigger DB CDN + Edge Caching None 9. System Design How should large report generation be handled? Choose the best architectural decision.Deselect Answer UI thread HTTP request thread Async background job Synchronous DB None 10. System Design Which store is ideal for time-series metrics? Choose the best architectural decision.Deselect Answer Graph DB Time-series database FTP Object storage None 11. System Design Which pattern prevents duplicate order submissions? Choose the best architectural decision.Deselect Answer More memory Queue only Static variables Idempotency Token None 12. System Design What is the primary goal of bounded context? Choose the best architectural decision.Deselect Answer Shared entities Single schema Clear domain ownership More joins None 13. System Design Which design supports replaying business events? Choose the best architectural decision.Deselect Answer Cache CRUD only Batch files Event Sourcing None 14. System Design Users expect notifications even if one provider fails. Best design? Choose the best architectural decision.Deselect Answer Manual retry Cron job Single provider Multiple notification providers with fallback None 15. System Design Design a URL Shortener. Which database property is most important for ID generation? Choose the best architectural decision.Deselect Answer ACID only Large joins Triggers Uniqueness None 16. System Design Need to migrate from monolith with low risk. First step? Choose the best architectural decision.Deselect Answer Rewrite everything Extract one bounded context Replace database Move UI first None 17. System Design Designing a news feed requires fast timeline retrieval. Common optimization? Choose the best architectural decision.Deselect Answer Pre-compute timelines Full table scan Disable indexes One giant query None 18. System Design What should own its database in a microservices architecture? Choose the best architectural decision.Deselect Answer API Gateway Frontend Each service All services share one DB None 19. System Design Need tenant isolation in SaaS. Preferred architecture? Choose the best architectural decision.Deselect Answer Logical/physical tenant isolation Shared global tables only FTP CSV None 20. System Design Which architecture supports millions of IoT events? Choose the best architectural decision.Deselect Answer Desktop app Single monolith FTP Event-driven architecture None 21. System Design Best place to terminate SSL/TLS? Choose the best architectural decision.Deselect Answer Load Balancer/API Gateway Database Redis Kafka None 22. System Design Which design best supports eventual consistency? Choose the best architectural decision.Deselect Answer Single transaction across services Event-driven architecture Global lock Shared session None 23. System Design What improves database read scalability without changing writes? Choose the best architectural decision.Deselect Answer Extra queues Vertical JVM scaling Read replicas More indexes only None 24. System Design Best approach for distributed locking? Choose the best architectural decision.Deselect Answer HashMap Local synchronized block Static variable Redis/ZooKeeper based lock None 25. System Design Which pattern handles temporary spikes without losing requests? Choose the best architectural decision.Deselect Answer Polling Thread.sleep() Synchronous REST Queue buffering None 26. System Design Need real-time fraud detection from transactions. Best architecture? Choose the best architectural decision.Deselect Answer FTP Email Nightly batch Event streaming + Rules Engine None 27. System Design Which pattern prevents one failing dependency from exhausting all threads? Choose the best architectural decision.Deselect Answer Bulkhead Factory Strategy Singleton None 28. System Design What should be externalized from microservices? Choose the best architectural decision.Deselect Answer Entities Configuration Controllers Business logic None 29. System Design An e-commerce flash sale causes overselling. Best solution? Choose the best architectural decision.Deselect Answer Increase cache Inventory reservation with atomic updates Cron reconciliation Restart DB None 30. System Design Need global low-latency DNS routing. Use? Choose the best architectural decision.Deselect Answer Single IP SMTP Geo/Latency-based DNS FTP None Loading questions... Loading questions... Please fill in the comment box below. Previous Start Quiz Next Time's up
