COMPTIA A+ Practice Exam

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What is the function of the back side bus?

Connects the CPU to external memory
Carries data between CPU and cache
Transfers video data
Connects the motherboard to peripheral devices

The correct answer is: Carries data between CPU and cache

The back side bus (BSB) is responsible for carrying data between the Central Processing Unit (CPU) and cache, specifically the Level 2 (L2) cache. This allows for faster data transfer and processing speeds since the cache is located closer to the CPU than external memory. The other options, while involved in data transfer and communication, are not the primary function of the BSB. Option A is incorrect because external memory is typically connected through the front side bus (FSB). Option C is incorrect because video data is usually transferred through a dedicated video bus. Option D is incorrect because the motherboard is connected to peripheral devices through the expansion slots, not the back side bus.