問41
頻出度★☆☆
テレワークを推進しているある会社では, サテライトオフィスを構築している。サテライトオフィスで使用するネットワーク機器や PC を対象に, 落雷による過電流を防止するための対策を検討した。有効な対策として, 最も適切なものはどれか。
令和4年度 ITパスポート試験 問41
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This question's explanation and your answers so far.
解説
問 41
Incorrectア
Green IT is a concept for reducing environmental impact through measures such as power saving and recycling; it is unrelated to preventing overcurrent caused by lightning strikes and does not serve as a countermeasure.
- イ
正解 When a lightning strike occurs, a momentary overvoltage and overcurrent called a “surge” is induced on power lines or communication lines, and this can destroy network equipment and PCs. “Surge protection” is a measure that detects this surge and diverts it to the ground (earth), suppressing the overcurrent flowing into equipment; power strips designed for lightning surges (surge protectors) are examples of this. Because it directly matches the question’s goal of preventing overcurrent caused by lightning strikes, installing equipment with surge protection is the most appropriate, so the correct answer is “イ”.
Incorrectウ
A wireless LAN router is a device for connecting a network wirelessly; it has no function to protect equipment from lightning surges and does not serve as a measure to prevent overcurrent.
Incorrectエ
An uninterruptible power supply (UPS) is a device that temporarily continues to supply power during a power outage or a momentary voltage drop, and its main purpose is to deal with power outages. Since it is not a mechanism for diverting overcurrent (surges) caused by lightning strikes, it is not optimal as a measure for this purpose.
ここがポイント
- Surge protection (a surge protector) is a measure that protects electronic equipment from the momentary overvoltage and overcurrent called a “surge” that arises from events such as lightning strikes.
- A UPS is a safeguard against power outages and voltage drops, while surge protection is a safeguard against overcurrent (lightning surges); it is important to distinguish that the threats they address are different.
用語