平成28年度春期 ITパスポート試験問85

This question's explanation and your answers so far.

問85

頻出度★☆☆

利用者がPCの電源を入れてから, そのPCが使える状態になるまでを四つの段階に分けたとき, 最初に実行される段階はどれか。

出典　平成28年度春期 ITパスポート試験問85

解説

問 85

ア
正解 The order from powering on a PC to finishing boot is “BIOS (firmware) → OS → device drivers → resident applications.” When the power is turned on, the BIOS built into the ROM on the motherboard starts first; it initializes the hardware, runs a self-test (POST), and reads the bootloader from the boot device. Therefore, among the four stages, the one executed first is loading the BIOS, so the correct answer is ア.
Incorrectイ
Loading the OS takes place after the BIOS has initialized the hardware and identified the boot device. Because the BIOS must run before the OS itself can be loaded, this is not the first stage.
Incorrectウ
Resident applications such as antivirus software are loaded in the last stage, after the OS has started and the operating environment is ready. This is the latest of the four stages, not the first.
Incorrectエ
Loading the device drivers is what lets the OS control the hardware, and it takes place after the OS is loaded. Since this stage comes after the BIOS, it is not the first.

ここがポイント

PC startup order (boot sequence): loaded in the order BIOS (initialization and POST after power-on) → OS → device drivers → resident applications.
The BIOS is firmware stored in ROM; it runs first immediately after power-on, and its role is to initialize the hardware and invoke the bootloader.

用語

解答問85ア