单项选择题
A. upstream node
B. originating node
C. destination node
D. downstream node
单项选择题 An ERX Edge Router is operating in an MPLS network using interface label space.What is used to make a forwarding decision?（）
单项选择题 A router receives a packet from a neighbor with an MPLS shim header value of 0.What does the router do with this packet?（）
单项选择题 With MPLS Fast Reroute, what is the "point of local repair"?（）