Write Policies (Write-Through, Write-Back) MCQs

By: Prof. Dr. Fazal Rehman | Last updated: June 23, 2025

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1. : What is the primary characteristic of the “write-through” cache policy?





2. : Which write policy ensures that data is only updated in the cache and written back to the main memory only when the cache line is evicted?





3. : What advantage does the “write-back” cache policy offer over “write-through”?





4. : In which scenario is the “write-through” cache policy most advantageous?





5. : Which write policy is likely to generate more bus traffic in a multiprocessor system?





6. : How does the “write-back” policy affect the cache’s performance in terms of write operations?





7. : Which write policy would be preferred if minimizing write latency to the main memory is crucial?





8. : What is a significant drawback of the “write-back” policy compared to “write-through”?





9. : Which policy is generally used to ensure that all data modifications are immediately reflected in the main memory?





10. : How does the “write-back” policy help in reducing write traffic to main memory?





11. : Which write policy could potentially lead to a higher risk of data loss in case of a system crash?





12. : What does the “write-through” policy ensure in terms of data consistency?





13. : Which write policy is more suitable for systems where data consistency is critical and must be maintained at all times?





14. : In which write policy are cache lines updated in the main memory only when they are evicted from the cache?





15. : How does “write-through” affect overall system performance compared to “write-back”?





16. : Which write policy is less complex to implement in terms of cache coherence protocols?





17. : What is a common advantage of using the “write-back” cache policy in a high-performance computing system?





18. : Which policy involves writing data to the cache and the main memory simultaneously with every update?





19. : What could be a major disadvantage of using the “write-through” policy in a system with high write activity?





20. : Which write policy is likely to lead to more consistent data across multiple caches in a multiprocessor system?





21. : What is a disadvantage of the “write-back” policy when compared to “write-through” in terms of data consistency?





22. : Which policy would be more efficient in a system where writes to the main memory are infrequent and performance is critical?





23. : How does the “write-back” policy affect cache coherence compared to “write-through”?





24. : Which write policy involves updating main memory on every write operation to the cache?





25. : What is the impact of the “write-back” policy on cache performance in terms of data writes?





26. : Which write policy would be best suited for applications with high write-throughput requirements and a need for immediate data consistency?





27. : How does the “write-back” policy affect the cache-to-main-memory update process?





28. : Which write policy would be less suitable for a system where data consistency must be maintained at all times?





29. : In a system with a “write-through” policy, what happens to data when a cache line is updated?





30. : What is a key difference between the “write-through” and “write-back” cache policies?





31. : Which write policy provides more immediate data consistency but can lead to higher write latency?





32. : How does the “write-back” policy affect the frequency of memory writes in a system?





33. : Which write policy ensures that every write operation updates both the cache and the main memory, ensuring immediate consistency?





34. : In a “write-back” policy, what happens to the data in the cache when it is modified?





35. : Which cache policy would likely result in lower main memory write traffic in a system?





36. : What impact does the “write-through” policy have on the cache line eviction process?





37. : Which write policy is more likely to cause data inconsistencies if not managed properly?





38. : What does the “write-back” policy typically do when a cache line is evicted?





39. : Which policy is likely to be favored in systems where write operations are less frequent, but performance is critical?





40. : What is a common advantage of the “write-through” policy for data consistency?





41. : Which write policy would be more suitable for a scenario where minimizing the number of main memory writes is a priority?





42. : How does the “write-back” policy impact the coherence of data between caches and main memory?





43. : What is a drawback of using “write-through” policy in systems with high data modification rates?





44. : Which policy involves immediate updates to main memory for every write operation, thus reducing the complexity of cache coherence?





45. : What is the main disadvantage of the “write-back” policy in terms of data synchronization?





46. : Which write policy is advantageous for applications that require frequent writes but can tolerate data staleness?





47. : In the context of cache policies, what is a common benefit of “write-back” over “write-through”?





48. : Which write policy would be less complex in terms of maintaining cache coherence across multiple processors?





49. : What effect does the “write-back” policy have on the cache-to-main-memory write operations?





50. : Which write policy can be advantageous in systems with high-frequency writes and lower data consistency requirements?





 

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