ITPEC IP October 2022 Question 11
ITPEC IP October 2022 — Question 11 of 100
Cache memory reduces the effective time required to access data that would otherwise come from main memory. It keeps copies of recently or frequently used instructions and data in a small, fast memory close to the CPU. A cache hit avoids the longer main-memory access.
Answer (b)
Why not others:
- cache is far smaller than main memory
- a large main memory does not remove the CPU–memory speed gap
- hardware and replacement policies manage cache contents automatically; users do not select resident programs
Key rule: Cache exploits temporal and spatial locality to bridge the speed difference between the CPU and main memory.
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