Which operation is represented in the exhibit?

Question

Exhibit

Options

• AWrite-back Cache
• BRead Cache Miss
• CWrite-through Cache
• DRead Cache Hit

• A
  7% (2)
• B
  73% (22)
• C
  17% (5)
• D
  3% (1)

Explanation

Option B is correct because a Read Cache Miss occurs when the CPU requests data, checks the cache first, fails to find it there, and must then retrieve it from main memory - the exhibit likely shows this two-step lookup: cache check → fallback to RAM, with the data subsequently loaded into the cache.

Why the distractors are wrong:

• A (Write-back Cache): A write-back operation involves writing data to the cache first and only updating main memory later; no read request is involved.
• C (Write-through Cache): Write-through writes data to both cache and main memory simultaneously on every write - again, this is a write operation, not a read.
• D (Read Cache Hit): A cache hit means the requested data was found in the cache, so no memory access is needed - the opposite of what the exhibit shows.

Memory tip: Think of the cache like a sticky note on your desk. A Hit means the answer is already on the note (fast). A Miss means you have to dig through your filing cabinet (slow) - and then you write it on the sticky note so next time is faster.

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