What is the function of user authentication in network security?

User authentication is a crucial aspect of network security, as it serves the primary function of verifying the identity of users accessing systems. This process ensures that only authorized individuals are granted access to sensitive resources and information, thus protecting the network from unauthorized access, data breaches, and other security threats.

By confirming the identity of users, authentication mechanisms help maintain the integrity and confidentiality of data within the network, as they prevent impersonation and ensure that privileges are only extended to legitimate users. Common methods of user authentication include passwords, biometric scans, multi-factor authentication, and digital certificates, each contributing to a robust security posture.

The other choices provided do not align with the focus of user authentication. High-speed access to resources pertains more to performance rather than verification of user identity. Creating backup copies relates to data redundancy and recovery strategies, while monitoring network traffic is associated with intrusion detection and anomaly response rather than user verification. Thus, the emphasis on identity verification highlights the critical role user authentication plays in safeguarding network security.