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CompTIA 220-802 Certification Practice Test

Category - 802

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What happens when shadowing options are enabled on a computer BIOS?
  1. Values are stored twice in the memory for redundancy checking.
  2. Conventional memory is remapped to the top of the extended memory.
  3. Data stored in RAM and adaptive card is shadowed into extended memory.
  4. Instructions stored in various ROM chips are copied into RAM.
Explanation
Answer: D - When the shadowing option is enabled in the BIOS, all instructions stored in the ROM is copied into the RAM.

Key Takeaway: Shadow RAM is the process of copying the contents of a ROM directly into extended memory which is given the same address as the ROM, from where it will run much faster. The original ROM is then disabled and the new location is Writeprotected. Access in shadow RAM is typically in the 60-100 nanosecond range whereas ROM access is in the 125-250 ns range.
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