SSL/TLS can be used to protect VPNs by creating a secure encrypted tunnel between the VPN server and client devices. SSL/TLS ensures that all communication between the VPN server and client is encrypted, preventing unauthorized access to sensitive information. Additionally, SSL/TLS can be used to authenticate the VPN server and client devices, ensuring that only authorized devices can access the VPN network. Finally, SSL/TLS can be used to monitor and prevent unauthorized access attempts, providing an additional layer of security for VPNs. Overall, SSL/TLS is an effective way to secure VPNs and protect sensitive information from cyber threats.