VTI in Site-to-Site VPN stands for:

The correct answer isA. VTI stands forVirtual Tunnel Interface. In Check Point Site-to-Site VPN, a VTI is used for route-based VPN. Instead of identifying VPN traffic only through encryption domains, the gateway can route traffic through a virtual interface that represents the VPN tunnel. Check Point’s R82 Site-to-Site VPN guide defines a Virtual Tunnel Interface as a virtual interface that is a member of an existing route-based VPN tunnel. This makes routing behavior more similar to routing through a physical interface, which allows the use of static or dynamic routing over the VPN. Option B, “VPN Transfer Interface,” is not a Check Point term. Option C incorrectly replaces “Tunnel” with “Transfer.” Option D sounds plausible, but the official expansion isVirtual Tunnel Interface, not VPN Tunnel Interface. The practical CCSE concept is that VTI belongs toRoute-Based VPN, while encryption-domain matching belongs toDomain-Based VPN. Reference topic:Route-Based VPN / VPN Tunnel Interfaces.

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