Which memory component is often described as a cache that sits between the CPU and main memory and can have multiple levels such as L1, L2, and L3?

Which memory component is often described as a cache that sits between the CPU and main memory and can have multiple levels such as L1, L2, and L3?

• A. RAM
• B. ROM
• C. Cache
• D. Storage

Answer: (C)

Cache memory is a small, fast storage layer between the CPU and main memory that speeds data access by keeping recently used data close to the processor. With multiple levels like L1, L2, and L3, it balances speed, size, and cost: L1 is the smallest and fastest on the CPU, L2 is larger and slower, and L3 is even larger and can be shared among cores. This arrangement reduces the time the CPU waits for data from main memory by exploiting locality of reference. RAM is the main memory where programs run, ROM stores firmware, and storage (like SSDs/HDDs) provides long-term non-volatile data. Therefore, the component described is the cache.

Cache memory is a small, fast storage layer between the CPU and main memory that speeds data access by keeping recently used data close to the processor. With multiple levels like L1, L2, and L3, it balances speed, size, and cost: L1 is the smallest and fastest on the CPU, L2 is larger and slower, and L3 is even larger and can be shared among cores. This arrangement reduces the time the CPU waits for data from main memory by exploiting locality of reference. RAM is the main memory where programs run, ROM stores firmware, and storage (like SSDs/HDDs) provides long-term non-volatile data. Therefore, the component described is the cache.