問68
頻出度★★★
PCにおける有害なソフトウェアへの情報セキュリティ対策として, 適切なものはどれか。
平成27年度 春期 ITパスポート試験 問68
テクノロジ系セキュリティ › 情報セキュリティ
This question's explanation and your answers so far.
解説
問 68
Incorrectア
Whether a 64-bit OS is used is a matter of performance and architecture — the data width that can be handled at once and the amount of main memory available — and has nothing to do with detecting or removing malware. Malware that also runs on 64-bit operating systems exists, so this alone is not a measure against harmful software.
- イ
正解 The correct answer is イ. Antivirus software (anti-malware software) detects infections by comparing the files it scans with a “virus definition file (pattern file, signature),” which records the characteristics of known malware. New malware and variants appear every day, so if the definition file stays old, the software cannot detect the latest threats at all, and the PC is effectively defenseless even though protection software is installed. Therefore, always keeping the virus definition file up to date (enabling automatic updates) is the basic and effective information security measure against harmful software on a PC.
Incorrectウ
Defragmentation is maintenance work that rearranges files stored in scattered fragments on a hard disk into continuous areas, easing the drop in access speed. Its purpose is to keep disk performance up; it has no function for finding or removing malware.
Incorrectエ
Compressing files aims to save storage capacity and shorten transfer time; it is not a security measure. On the contrary, the inside of a compressed file can sometimes be hard for antivirus software to scan, so it may even work against malware protection.
ここがポイント
- The basics of protecting against malware (computer viruses and the like) are to install antivirus software and, on top of that, always keep the virus definition file (pattern file) up to date. If the definition file is old, new malware and variants cannot be detected.
- Defragmentation, compression, and adopting a 64-bit OS are measures about performance or storage capacity, and their purpose differs from that of security measures — when choosing a measure, separate out what each measure actually protects.
用語