Which three features are benefits of using GRE tunnels in conjunction with IPsec for building site-to-site VPNs?()
- Aallows dynamic routing over the tunnel
- Bsupports multi-protocol (non-IP) traffic over the tunnel
- Creduces IPsec headers overhead since tunnel mode is used
- Dsimplifies the ACL used in the crypto map
- Euses Virtual Tunnel Interface (VTI) to simplify the IPsec VPN configuratio