多项选择题

What are three examples of a provider-provisioned VPN supported by JUNOS software？（）

A.L2F
B.PPTP
C.Circuit cross-connect
D.Draft-Martini-based VPNs
E.Draft-Kompella-based VPNs

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多项选择题

A.hdlc-ccc
B.atm-cell-ccc
C.cisco-hdlc-ccc
D.ethernet-vlan-ccc
E.ethernet-snap-ccc

单项选择题

A.Martini based VPN’s
B.2547bis based VPN’s
C.Sham link based VPN’s
D.Virtual Router based VPN’s

单项选择题

A.IGP
B.LDP
C.BGP
D.MPLS