A.PPP over Ethernet B.Cisco Express forwarding C.MPLS traffic Engineering D.IS-IS routing E.Unicast Reverse Path Forwarding(uRPF)
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