单项选择题 You would like toconfigure an ATM PVC with a virtual circuit identifier of 33 on virtual path 0.The PVC should use an unspecified bit rate and be encapsulated in the AAL5SNAP format. Which command accomplishes this goal?（）

单项选择题 Which configuration command creates a virtual router called isp-1？（）

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?（）