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

What is 'zero-day vulnerability'?
A. A vulnerability that is easy to fix
B. A vulnerability that only affects older systems
C. A vulnerability that has been known for a long time
D. A software vulnerability that is unknown to the vendor and has no patch
Answer: Option D
Solution (By JKSSB Mock Tests)
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.

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Practice More Cyber Security Questions

Question #1
What form of software vulnerability allows threat actors to execute arbitrary client-side scripts inside other users' browsers by compromising vulnerable web outputs?
A. Zero-Day Exploit
B. Buffer Overflow
C. Cross-Site Scripting (XSS)
D. SQL Injection

Correct Answer: Option C


Explanation:
XSS allows threat actors to execute malicious client-side scripts inside other users' browser views by compromising vulnerable web outputs.

This question belongs to: Computer Cyber Security
Question #2
What is the purpose of a security control?
A. To increase system performance
B. To reduce the risk of a security breach
C. To manage employee schedules
D. To install new software

Correct Answer: Option B


Explanation:
Security controls are measures implemented to protect assets, reduce risks, and ensure the confidentiality, integrity, and availability of information.

This question belongs to: Computer Cyber Security
Question #3
What is the purpose of a vulnerability assessment?
A. To fix all security issues
B. To identify and quantify security vulnerabilities in a system
C. To install security patches
D. To monitor network traffic

Correct Answer: Option B


Explanation:
A vulnerability assessment is a process that identifies, quantifies, and prioritizes vulnerabilities in a system, providing a basis for remediation.

This question belongs to: Computer Cyber Security