CCNA: Cisco Certified Network Associate — Question 809

What is a zero-day exploit?

Answer options

• A. It is when the network is saturated with malicious traffic that overloads resources and bandwidth.
• B. It is when an attacker inserts malicious code into a SQL server.
• C. It is when a new network vulnerability is discovered before a fix is available.
• D. It is when the perpetrator inserts itself in a conversation between two parties and captures or alters data.

Correct answer: C

Explanation

The correct answer is C because a zero-day exploit specifically refers to a vulnerability that is newly discovered and has no available patch. Options A, B, and D describe different types of attacks but do not relate to the concept of a zero-day exploit.