Which type of attack does a Denial of Service (DoS) aim to execute?

• A. To exfiltrate confidential data
• B. To gain unauthorized access to a system
• C. To make a service unavailable to users
• D. To install malware on a user's device

Answer: (C)

A Denial of Service (DoS) attack is designed specifically to make a service unavailable to users. This type of attack overwhelms a system, service, or network with an influx of requests, causing it to slow down significantly or crash altogether. The primary goal of a DoS attack is to disrupt legitimate users' access to the service, making it impossible for them to utilize the resources or functionality that they normally would.

In the context of cyber threats, DoS attacks do not focus on stealing data, accessing systems without authorization, or installing malware. Instead, they are characterized by their impact on service availability, creating a situation where legitimate users cannot access the targeted resource, thus achieving their goal of disruption.