单选题How is an RSVP resv message sent back to the ingress router?（）Areverse path of the RROBleast cost to the ingress routerCshortest path to the egress routerDreverse path of the path vector TLV
单选题
How is an RSVP resv message sent back to the ingress router?（）
A
reverse path of the RRO
B
least cost to the ingress router
C
shortest path to the egress router
D
reverse path of the path vector TLV
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