多项选择题
Which four services use the inner labels of an MPLS label stack？ （）
A.MPLS VPN B.switching path in MPLS core C.Cisco MPLS Traffic Engineering and Fast Reroute D.MPLS over ATM E.VPN over Traffic Engineering core F.any transport over MPLS
单项选择题 WhatisthedefaultmaximumtransmissionunitontheCiscorouterATMinterface？（）
单项选择题 WhataretheAddressFamilyIdentifier（AFI）andSubsequentAddressFamilyIdentifier（SAFI）valuesforVPNv6？（）
单项选择题 WhichstatementaboutL2VPNPseudowireSwitchingisnottrue？（）
