問74
頻出度★☆☆
停電や落雷などによる電源の電圧の異常を感知したときに, それをコンピュータに知らせると同時に電力の供給を一定期間継続して, システムを安全に終了させたい。このとき, コンピュータと電源との間に設置する機器として, 適切なものはどれか。
平成29年度 秋期 ITパスポート試験 問74
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This question's explanation and your answers so far.
解説
問 74
Incorrectア
A DMZ (demilitarized zone) is a buffer area placed at the boundary between the external and internal networks; it isolates public-facing servers to raise security and is a segment on the network. It has nothing to do with power backup or power supply, so it cannot serve the purpose in the question.
Incorrectイ
A GPU (graphics processing unit) is a processing device for performing image and video processing and parallel computation at high speed. It improves rendering performance and computing power, but does nothing for supplying power during an outage or for shutting down safely.
- ウ
正解 The correct answer is “ウ”, the UPS (Uninterruptible Power Supply). A UPS is installed between the computer and the power source (the outlet side) and has a built-in battery. When it detects an abnormality in the power supply voltage caused by a power outage, lightning strike, or the like, it instantly switches to battery power and continues supplying power for a certain time, while at the same time notifying the computer of the abnormality through dedicated software or a signal line. This lets you save your work before the power is completely lost and shut down the OS through the normal procedure, so it satisfies all three conditions in the question: notify of the abnormality, continue supplying power for a certain period, and shut down the system safely.
Incorrectエ
A VPN (virtual private network) is a technology that builds an encrypted virtual dedicated line over public lines in order to communicate securely. It is a mechanism for ensuring communication security and is unrelated to detecting power abnormalities or continuing power supply from a battery.
ここがポイント
- UPS (Uninterruptible Power Supply) = a device that supplies power from a battery for a certain time during a power outage or voltage abnormality and notifies the computer so the system can shut down safely. It is installed between the computer and the power source.
- Identifying the abbreviations: DMZ and VPN belong to network security, a GPU is a processing device, and a UPS is power equipment. Judge right from wrong by the difference in field.
用語