多选题Which three features are benefits of using GRE tunnels in conjunction with IPsec for building site-to-site VPNs？（）Aallows dynamic routing over the tunnelBsupports multi-protocol （non-IP） traffic over the tunnelCreduces IPsec headers overhead since tunnel mode is usedDsimplifies the ACL used in the crypto mapEuses Virtual Tunnel Interface （VTI） to simplify the IPsec VPN configuration
多选题
Which three 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
reduces IPsec headers overhead since tunnel mode is used
D
simplifies the ACL used in the crypto map
E
uses Virtual Tunnel Interface （VTI） to simplify the IPsec VPN configuration
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