A.PPP over Ethernet
B.Cisco Express forwarding
C.MPLS traffic Engineering
D.IS-IS routing
E.Unicast Reverse Path Forwarding（uRPF）
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A.Version
B.Label
C.COS/EXP
D.TTL
E.S flag
A.It adds the VPN label into the top label in the MPLS label stack
B.It replaces the top label in the MPLS label stack with a VPN label and propagates
C.It replaces the bottom label in the MPLS label stack with a VPN label and propagates
D.It removes the top label in the MPLS label stack and does a Layer 3 lookup on underlying IP packets
E.None of above
A.Packet-based switching devices
B.VPI/VCI-based switching devices
C.Non-Packet-based devices
D.None of the above
E.A and B
A.TE middle point
B.TE tail end
C.TE head end
D.All TE nodes along the path
E.Independent server
A.0ms
B.10ms
C.500ms
D.1s
E.5s
F.30s
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