多项选择题
A.line quality
B.distance from the CO
C.brand of xDSL modem
D.number of twisted-pair wires used
单项选择题 Your ERX router is supporting 100 virtual routers.A specific line module supports IP interfaces in 5 virtual routers.How many routing tables are maintained on that module？（）
单项选择题 Beginning with software version 4-0-0.rel，how many virtual routers canbe configured on the ERX Edge Router？（）
多项选择题 Which two parameters are virtual router specific？（）