engineering computer science MCQ #269

engineering computer science MCQ #269

1. Question 1

   Q1. What is the purpose of the 'dirty' bit in a cache memory system?

   • A) To indicate that a cache line is valid
   • B) To indicate that a cache line has been modified
   • C) To indicate that a cache line is empty
   • D) To indicate that a cache line is being accessed

   Answer: To indicate that a cache line has been modified

   Explanation: The 'dirty' bit is set when a cache line is modified, indicating that it must be written back to main memory when it is replaced.