单项选择题 When does the E-series router start monitoring DHCP traffic using the DHCP External function?（）

单项选择题 Which CLI command is used to display the IP address assigned to Dynamic Subscriber Interface and related hardware address using the DHCP Relay Proxy function?（）

多项选择题 Which two E-series functions allow Bridged Ethernet subscribers the ability to recieve a dynamic IP address? （）(Choose two.)