单项选择题

Which multicast mode does Auto-RP require?（）

A. Link-mode
B. Dense mode
C. Sparse mode
D. Sparse-dense mode

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多项选择题

A. MPLS LSP
B. ATM tunnel
C. GRE tunnel
D. IPSEC tunnel
E. L2TPv3 session

单项选择题

A. to create a partial mesh of VPN sites
B. to remove MPLS from VPNs
C. to create a point to multipoint topology
D. to enable IPsec accross the VPN

多项选择题

A.L2TP
B.2547bis
C.L2F
D.PPTP
E.MPLS