A.head-end router and tail-end router
B.middle-point router
C.head-end router
D.tart-end router
E.tail-end router
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A.show ip vrf all
B.show ip vrf route-targets all
C.show ip vrf summary
D.show ip vrf interfaces
E.show ip vrf detail
F.show ip vrf
A.If it is triggered by Type 4， all Type 4 LSAs that announce a certain ASBR and all Type 5 and 7 LSAs are processed
B.If it is triggered by Types 5 and 7， all Type 5 and 7 LSAs that contribute to a certain destination are processed.
C.If it is triggered by Type 2， all Type 2 LSAs that contribute to a certain destination are processed.
D.If it is triggered by the change of Type 3， 4， 5， and 7 LSAs.
E.If it is triggered by the change of Type 2， 3， 5， and 7 LSAs
A.NetFlow records bidirectional IP traffic flow.
B.NetFlow export can be implemented over IPv4.
C.NetFlow export can be implemented over IPv6.
D.NetFlow records multicast IP traffic flow.
E.NetFlow records ingress traffic.
F.NetFlow records egress traffic.
A.It does not support all underlying unicast routing protocols like BGP
B.Receivers are registered with RP by their first hop router
C.From the RP， traffic flows down a source tree to each receiver.
D.It supports shared trees only， and assumes all hosts want the multicast traffic
E.Receivers are joined to the shared tree by their local designated router
A.After the route target replacement policy is applied to the target router， the BGP session need not be refreshed manually to put the policy into operation.
B.Route Target Rewrite allows the administration of the routing policy to stay local to the AS.
C.Route target replacement is always done by the ASBR.
D.Route target rewrites are supported for VRF export maps.
E.Route target replacement can be done on incoming and outgoing BGP updates.
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