問50
頻出度★★★
セキュリティワイヤの用途として, 適切なものはどれか。
平成22年度 秋期 ITパスポート試験 問50
This question's explanation and your answers so far.
解説
問 50
Incorrectア
Preventing equipment from being burned up by a fire is the role of fire-fighting measures such as fire-extinguishing equipment (in a server room, gas systems using halon substitutes and other methods that do not damage equipment with water), fire compartments and fire doors, fireproof safes, and fire alarms. A security cable is merely a device that fixes equipment in place with a metal cable, and it has no function at all for protecting equipment from heat or flames. On the contrary, because the equipment is fixed to the desk by the cable, it becomes even harder to carry important equipment out to safety when a fire breaks out.
- イ
正解 The correct answer is “イ Prevent the theft of a notebook PC installed in an office.” A security cable (also called a security wire or a wire lock) is a device whose lock end is inserted into the small rectangular hole (the security slot) provided on the body of a notebook PC, a display, a projector, and so on and locked there, while the sturdy cable at the other end is wrapped around and fastened to something immovable such as a desk leg or a pillar. It cannot be removed unless the key lock or the combination lock is released, so the equipment can no longer be carried away from where it is. A notebook PC is small and light and therefore easy to carry around, but for that same reason, if it is left in an office or a meeting room it can easily be taken away once you leave your seat. So if you tie it to the desk with the cable, the equipment itself cannot be taken out even while you are away from your seat or at night, and as a result you protect not only the machine itself but also prevent the leakage of the information stored inside it. Preventing theft by physically fixing equipment in place in this way is the use of a security cable, and in the classification of information security measures it falls under “physical security measures.”
Incorrectウ
Preventing others from peeping at the screen of a notebook PC from the side while it is used outside the company (on a train, in a cafe, and so on) — so-called shoulder hacking — is the role of a privacy filter (an anti-peeping film). Once it is attached to the screen, the screen is still visible from directly in front but becomes dark and unreadable from an angle. A security cable ties equipment to a fixed object, so it has no effect of hiding what is displayed. In addition, outside the company there is often no suitable fixed object such as a desk or a pillar, and it is a measure that has nothing to do with screen visibility in the first place.
Incorrectエ
Supplying alternative power during a power outage is the role of a UPS (uninterruptible power supply) or a private power generator. A UPS supplies power temporarily from its built-in battery, and during that time it lets you shut the system down safely or switch over to a private generator. A security cable is, after all, just a metal cable that physically fixes equipment in place; it is not a power cable, so it has no function of supplying electricity.
ここがポイント
- A security cable (security wire) = a physical security tool that locks into the security slot of a notebook PC or similar device and ties it with a cable to a fixed object such as a desk or a pillar, so that the device cannot be carried away. In one phrase, its purpose is theft prevention.
- Sort out easily confused measures by the threat each one defends against: theft → security cable, lock management, entry and exit control; peeping → privacy filter; power outage → UPS, private power generator; fire → fire-extinguishing equipment, fire compartments, fireproof safe. If you memorize this table of threats and countermeasures, you can eliminate the wrong choices immediately.
用語