单项选择题
A.It allows L2F tunnels across the network. B.It allows GRE tunnels across the network. C.It allows PPTP tunnels across the network. D.It allows PPP to be tunneled across a network
A.Requires only one tunnel switching license. B.Requires two licenses，one for inbound and one for outbound sessions. C.Enabled automatically when the BSR is configured as an LAC and LNS. D.Aids in L2TP tunnel scaling
A.l2tp tunnel test anyone@isp1.com B.test l2tp session anyone@isp1.com C.test l2tp tunnel anyone@isp1.com D.tunnel l2tp test anyone@isp1.com