問74
頻出度★★★
スマートフォンを安全に利用するために行うこととして, 適切なものはどれか。
平成27年度 秋期 ITパスポート試験 問74
This question's explanation and your answers so far.
解説
問 74
Incorrectア
Using the phone in its as-purchased state without updating the OS is dangerous. OS updates include security fixes that patch discovered vulnerabilities, so neglecting updates leaves the device continuously exposed to known attacks. To use it safely you should instead update promptly; this option does the opposite, so it is wrong.
Incorrectイ
Privilege escalation (modifications such as rooting or jailbreaking) disables the security protections put in place by the manufacturer and raises the risk of malicious apps intruding and malware infection. Even if it enhances functionality, safety is greatly compromised, so from the standpoint of safe use it is inappropriate and wrong.
- ウ
正解 “ウ”is correct. If you set up a screen lock that uses a password in advance, then even if the smartphone is lost or stolen, a third party who does not know the password cannot unlock the screen and therefore cannot access the contacts, email, photos, and various apps stored inside. This is the most basic and effective measure for using the device safely, and it matches what the question asks about “things done in order to use it safely”.
Incorrectエ
The behavior of assuming it is fine to download an app from any website as long as you consider it useful is dangerous. Sites of unknown origin sometimes distribute fake apps embedded with malware. For safety you should obtain apps only from trusted sources such as official app stores, so it is wrong.
ここがポイント
- Basic smartphone security measures: setting up a screen lock (password or biometric authentication), promptly updating the OS and apps, and obtaining apps only from trusted sources — these are the right directions.
- Privilege-escalation modifications such as rooting or jailbreaking disable the manufacturer's security protections and increase risk, so they run counter to safe use.
用語