ITPEC IP April 2023 Question 38
Among the countermeasures A through D concerning information security, which of the following is the list that contains all and only the appropriate countermeasures for virus infections?
Explanation
A and B — antivirus software stops known malware, and security patches close the holes malware uses to get in.
- •A — antivirus software scans files, e-mail and downloads and blocks known malicious code before it runs, provided its pattern files are kept up to date
- •B — many viruses and worms infect through vulnerabilities in the OS or applications; the patch removes the vulnerability
- •C — a hard-disk password stops someone else using a stolen disk; it does nothing against a virus arriving while the legitimate user works
- •D — encryption keeps file contents confidential; a virus running with the user's rights can still infect or destroy the files
Answer (a)
Why not others:
- •(b) A, B, C — adds C, a countermeasure against theft, not infection
- •(c) A, D — adds D, which protects confidentiality, and omits B, patching
- •(d) B, C — omits A, antivirus software, and adds C
Key rule: Match each control to its threat: infection is prevented by detecting malicious code and removing vulnerabilities, while passwords and encryption guard against unauthorized access and disclosure.
Security · AI-written, may contain errors
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