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User authentication is crucial for implementing file security on a server because it ensures that only authorized individuals can access sensitive data. This process verifies the identity of users trying to access files, typically through usernames and passwords, biometric scans, or security tokens. By enforcing user authentication, organizations can maintain control over their data, restricting access to only those who have been granted permissions, thereby preventing unauthorized access or modifications.

While firewall settings, IP filtering, and remote access control are essential components of network security and can complement file security, they do not specifically manage who can access files on the server. Firewalls protect the network by blocking unwanted traffic, IP filtering restricts access based on IP addresses, and remote access control manages how users connect to the server remotely. However, none of these mechanisms provide the specific user-level authentication needed to secure file access directly.