Fill in the blank: A _______ is used by a VPN gateway to send traffic as if it were a physical interface.

A. VPN Tunnel Interface

B. VPN community

C. VPN router

D. VPN interface

Explanation: Route Based VPN

VPN traffic is routed according to the routing settings (static or dynamic) of the Security Gateway operating system. The Security Gateway uses a VTI (VPN Tunnel Interface) to send the VPN traffic as if it were a physical interface. The VTIs of Security Gateways in a VPN community connect and can support dynamic routing protocols.

Reference:http://sc1.checkpoint.com/documents/R77/CP_R77_VPN_AdminGuide/13868.htm