Which of the following defines prevention controls in network security?

In network security, prevention controls are specifically designed to thwart unauthorized access to information systems and data. These controls can include firewalls, intrusion detection systems, access control lists, and other security mechanisms that create barriers to prevent threats from breaching the network's defenses.

By focusing on stopping potential threats before they can do harm, these strategies play a fundamental role in maintaining the integrity, confidentiality, and availability of information. They aim to mitigate risks and ensure that only authorized users can access sensitive data or systems, thus safeguarding organizational assets from malicious activities.

Other choices, while relevant to certain aspects of network management or user interaction, do not directly pertain to the primary goal of prevention controls in network security. For example, enhancing user experience pertains to usability rather than security, reducing system downtime relates to operational reliability, and data backup focuses on recovery rather than prevention.