What is 'zero-day vulnerability'? MCQ with Answer and Explanation

What is 'zero-day vulnerability'?

A. A vulnerability that has been known for a long time

B. A vulnerability that is easy to fix

C. A software vulnerability that is unknown to the vendor and has no patch

D. A vulnerability that only affects older systems

Answer: Option C

Solution (By JKExamLibrary)

A zero-day vulnerability is a flaw in software that is unknown to the vendor, meaning there is no official patch available at the time it is discovered.

This question belongs to: Computer Cyber Security

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Which administrative security tool establishes a mandatory company rule requiring passwords to contain uppercase letters, numbers, and symbols while expiring every 90 days?

A. Password Policy Enforcement Subsystem

B. Access Control List Matrix

C. Multi-Factor Registry Check

D. Firewall Inspection Script

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Correct Answer: Option A

Explanation:
Password policy modules enforce programmatic rules regarding credential complexity, length, and rotation cycles to defend against automated cracking attempts.

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Question #2 Report Error

What form of phishing threat targets mobile phone users explicitly by broadcasting fraudulent SMS text messages disguised as notifications from delivery firms or financial institutions?

A. Vishing Attempt

B. Whaling Attack

C. Smishing (SMS Phishing)

D. Pharming Scam

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Correct Answer: Option C

Explanation:
Smishing combines SMS short messaging with classic phishing logic, luring cellular targets to click compromised web addresses embedded in text notifications.

This question belongs to: Computer Cyber Security

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What form of software flaw allows a threat actor to trigger an application error by packing more data into a memory allocation sector than it can hold, overwriting processing tracks?

A. Cross-Site Scripting

B. Buffer Overflow

C. Zero-Day Exploit

D. SQL Injection

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Correct Answer: Option B

Explanation:
Buffer overflows occur when input variables exceed memory segment boundaries, allowing malicious payloads to alter memory instructions and execute arbitrary commands.

This question belongs to: Computer Cyber Security

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