問95
頻出度★☆☆
情報セキュリティの物理的及び環境的セキュリティ管理策において, サーバへの電源供給が停止するリスクを低減するために使用される装置はどれか。
平成30年度 春期 ITパスポート試験 問95
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This question's explanation and your answers so far.
解説
問 95
Incorrectア
A DMZ (demilitarized zone) is a buffer network area placed between the internal network and the internet, where public servers and the like are located to separate the network. It is a network-security measure, unrelated to power supply, so it is wrong.
Incorrectイ
An IDS (intrusion detection system) detects signs of unauthorized access or attacks against a network or server and notifies the administrator. It is a security-monitoring device and does not secure power, so it is wrong.
Incorrectウ
A PKI (public key infrastructure) is an infrastructure that uses public-key cryptography and digital certificates to achieve communication encryption and identity authentication. It is a mechanism that protects confidentiality and integrity, unrelated to the risk of power interruption, so it is wrong.
- エ
正解 Choice エ, UPS (Uninterruptible Power Supply), is correct. A UPS has a built-in battery and, when the commercial power fails, drops in voltage, or briefly cuts out, it immediately keeps supplying power to the server. This lowers the risk that the power supply suddenly stops, causing the server to shut down abnormally or lose data. It is exactly the availability measure (ensuring a stable power supply) within the physical and environmental security controls mentioned in the question, and it fits as a device that directly reduces the risk of power interruption.
ここがポイント
- A UPS (Uninterruptible Power Supply) supplies power from its battery during outages or brief interruptions, preventing abnormal server shutdown and data loss; it is an availability-oriented physical and environmental control device.
- DMZ, IDS, and PKI are all security terms related to networking or encryption/authentication; distinguish that their purpose differs from ensuring the power supply.
用語