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Exam 300-135 Question id=569 VPN Technologies

Which features are benefits of using GRE tunnels in conjunction with IPsec for building site-to-site VPNs?

A. allows dynamic routing over the tunnel
B. supports multi-protocol (non-IP) traffic over the tunnel
C. simplifies the ACL used in the crypto map
D. uses Virtual Tunnel Interface (VTI) to simplify the IPsec VPN configuration