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 only affects older systems
C. A vulnerability that is easy to fix
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 is the role of a firewall in a home network?
A. To manage user accounts
B. To provide Wi-Fi connectivity
C. To protect devices from external threats
D. To increase internet speed

Correct Answer: Option C


Explanation:
A home firewall protects personal devices from unauthorized access and malicious traffic coming from the internet.

This question belongs to: Computer Cyber Security
Question #2
What type of attack targets a web application by injecting malicious SQL statements into input forms, allowing the attacker to manipulate the underlying backend database directly?
A. SQL Injection (SQLi)
B. Buffer Overflow Attack
C. Cross-Site Scripting (XSS)
D. Denial of Service (DoS)

Correct Answer: Option A


Explanation:
SQL injection occurs when unvalidated user input is passed directly to a database query engine, enabling threat actors to view, alter, or delete database tables illegally.

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Question #3
Which of the following is a method to secure a wireless network?
A. Sharing the password publicly
B. Using an open network
C. Using WPA2 encryption
D. Disabling all security features

Correct Answer: Option C


Explanation:
Using WPA2 encryption is a standard security measure for wireless networks, providing strong protection against unauthorized access and eavesdropping.

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