Which level of CPU cache is closest to the processor core and typically smallest in size?

Which level of CPU cache is closest to the processor core and typically smallest in size?

• A. L1
• B. L2
• C. L3
• D. L4

Answer: (A)

Cache proximity and size differences in the CPU hierarchy are being tested. The closest cache to the processor core is the L1 cache, and it is typically the smallest in size. Its spot on the die right next to the core allows the fastest access, which is essential for keeping the most frequently used data and instructions ready. Because it’s so fast, it’s kept small to maintain very low latency. The next level up, L2, is larger and a bit slower, usually per core as well. L3 is even larger and often shared among multiple cores, leading to higher latency. L4 isn’t standard on all CPUs; when present, it’s larger and slower than L3. So the level closest to the core and smallest in size is L1.

Cache proximity and size differences in the CPU hierarchy are being tested. The closest cache to the processor core is the L1 cache, and it is typically the smallest in size. Its spot on the die right next to the core allows the fastest access, which is essential for keeping the most frequently used data and instructions ready. Because it’s so fast, it’s kept small to maintain very low latency. The next level up, L2, is larger and a bit slower, usually per core as well. L3 is even larger and often shared among multiple cores, leading to higher latency. L4 isn’t standard on all CPUs; when present, it’s larger and slower than L3. So the level closest to the core and smallest in size is L1.