ITPEC IP October 2021 Question 10
ITPEC IP October 2021 — Question 10 of 100
Cache memory reduces the effective time the CPU waits for main-memory access. It stores copies of frequently or recently used instructions and data in much faster memory close to the processor. A cache hit lets the CPU avoid a slower RAM access.
Answer (c)
Why not others:
- an SSD is secondary storage
- virtual memory expands address space with slower secondary storage
- defragmentation reorganizes fragmented disk blocks and does not accelerate CPU-to-RAM access
Key rule: Cache exploits temporal and spatial locality to bridge the speed gap between CPU and main memory.
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