问题:
A . QoS preclassification is only supported on generic routing encapsulation (GRE) and IPsec VPNs
B . QoS preclassification is not required in Layer 2 Tunneling Protocol (L2TP), Layer2 Forwarding (L2F), and Point-to-Point Tunneling Protocol (PPTP) VPNs
C . QoS preclassification is supported on IPsec AH VPNs, but not on IPsec ESP VPNs
D . the QoS-for-VPNs feature (QoS preclassification) is designed for VPN transport interfaces
E . with IPsec tunnel mode, the type of service (ToS) byte value is copied automatically from the original IP header to the tunnel header
● 参考解析
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