from CCSA R80 guide:
Before the VPN gateways can create VPN tunnels, they first need to authenticate to each other. Authentication is how the VPN gateways are completely certain that they can trust the other networks and share data. VPN gateways authenticate to each other by presenting one of the following types of credentials:
• Certificates
• Pre-shared secret
VPN gateways authenticate using Digital Certificates and Pre-shared secrets.
Reference: https://sc1.checkpoint.com/documents/R77/CP_R77_VPN_AdminGuide/85469.htm
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