多项选择题
n the case of Ethernet transport， which two types of attachment circuits does L2TPv3 support？ （）
A.port tunneling on the Ethernet subinterface B.VLAN tunneling on the Ethernet trunk C.port tunneling on the Ethernet interface D.VLAN tunneling on the Ethernet VLAN subinterface E.port tunneling on the Ethernet trunk
多项选择题 PackedCellRelayencapsulationwithAToMinclueswhichofthefollowing？（）
多项选择题 WhicharecorrectdescriptionsandconfigurationsofAnycastRP？（）
单项选择题 WhichofthefollowingIOSfeaturescanpreventIPspoofingattacks？（）
