单选题An ERX Edge Router is operating in an MPLS network using interface label space.What is used to make a forwarding decision?（）A EXP bitsB VPI / VCIC shim headerD SNAP header
题目
单选题
An ERX Edge Router is operating in an MPLS network using interface label space.What is used to make a forwarding decision?（）
A
EXP bits
B
VPI / VCI
C
shim header
D
SNAP header