Which of the following is a key benefit of implementing user identity authentication in a network?

Implementing user identity authentication is critical for enhancing security within a network, and one of the primary benefits is indeed the limitation it places on access for malicious users. By implementing stringent authentication mechanisms, organizations can ensure that only authorized users gain access to their network resources. This approach helps in verifying the identity of users, preventing unauthorized access that could lead to data breaches or the introduction of malware and other security threats.

When a user is authenticated effectively, it establishes a security baseline where each individual is required to provide valid credentials before accessing network services or sensitive information. This process not only deters potential attackers but also enables organizations to maintain greater control over who accesses what data and when, thereby significantly reducing the risk of malicious activity.

In contrast, the other options do not directly correlate with the primary purpose of user identity authentication. Increasing database storage capacity, higher internet bandwidth usage, and reduced hardware costs are not inherent results of implementing user authentication systems. Instead, these aspects are influenced by different factors related to network architecture, resource management, and organizational needs.