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？（）

单项选择题 You would like to configure your PC’s IP address of 10.10.0.156 as an FTP host with au ser name of user anda password of mypass.Which configuration command accomplishes this goal？（）