How does a denial-of-service attack work?

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A. A hacker prevents a legitimate user (or group of users) from accessing a service The primary objective of a denial-of-service attack is to render a computer, network, or service unavailable to its intended, legitimate users. This is typically achieved by overwhelming the target with traffic, exhausting system resources, or exploiting specific vulnerabilities to cause a crash or malfunction.

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B. A hacker uses every character, word, or letter he or she can think of to defeat authentication This describes a brute-force attack or a dictionary attack, which are methods for guessing credentials, not for making a service unavailable to legitimate users.

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C. A hacker tries to decipher a password by using a system, which subsequently crashes the While a flawed brute-force attempt might cause a system to crash, the core mechanism and intent of a denial-of-service attack are about making a service unavailable, not primarily deciphering a password.

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D. A hacker attempts to imitate a legitimate user by confusing a computer or even another person This describes impersonation, spoofing, or social engineering, where an attacker pretends to be a legitimate entity, which is distinct from a denial-of-service attack aimed at service disruption.

How does a denial-of-service attack work?

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