What type of attack focuses on denying legitimate users access to services?

A denial-of-service attack is designed specifically to disrupt the normal functioning of a targeted server, service, or network, thereby denying legitimate users access to those resources. This type of attack typically involves overwhelming the target with a flood of unnecessary requests, consuming its resources and rendering the service unavailable to legitimate users.

The attack exploits the capacity limits of systems or networks, making it difficult or impossible for legitimate users to access the service they need. By focusing on making the service unavailable rather than stealing data or gaining unauthorized access, a denial-of-service attack highlights the importance of maintaining service availability for users.

Other types of attacks mentioned, such as social engineering, network infiltration, and resource packet flooding, do not focus primarily on denying access to legitimate users in the way a denial-of-service attack does. Social engineering aims to manipulate individuals into revealing sensitive information, while network infiltration seeks to gain unauthorized access to a network. Resource packet flooding could be a mechanism used in a denial-of-service attack but does not encompass the broader objective of denying service itself.