Secure VPN Connections Establishing a secure VPN connection requires configuring openVPN with robust encryption methods, multi-factor authentication, and secure key exchange protocols. Access Control Lists Configuring ACLs in Linux systems to manage network resource, file, and directory access rights according to user roles and privileges, maintaining the integrity and secrecy of data by routing, updating, and reviewing ACL configurations. Intrusion Detection Systems Snort IDs are used to monitor network traffic for unusual activity, analyze risks found, and quickly respond to security problems. Adjusting Snort rules and parameters to reduce false alarms and improve detection