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 Which service does the ERX Edge Router support with a virtual router?()

多项选择题 What are two way sthat IP datagrams are passed from the ingress line module to the egress line module?（）